1. 15 Apr, 2015 23 commits
    • Roman Pen's avatar
      mm/vmalloc: get rid of dirty bitmap inside vmap_block structure · 7d61bfe8
      Roman Pen authored
      In original implementation of vm_map_ram made by Nick Piggin there were
      two bitmaps: alloc_map and dirty_map.  None of them were used as supposed
      to be: finding a suitable free hole for next allocation in block.
      vm_map_ram allocates space sequentially in block and on free call marks
      pages as dirty, so freed space can't be reused anymore.
      
      Actually it would be very interesting to know the real meaning of those
      bitmaps, maybe implementation was incomplete, etc.
      
      But long time ago Zhang Yanfei removed alloc_map by these two commits:
      
        mm/vmalloc.c: remove dead code in vb_alloc
           3fcd76e8
        mm/vmalloc.c: remove alloc_map from vmap_block
           b8e748b6
      
      In this patch I replaced dirty_map with two range variables: dirty min and
      max.  These variables store minimum and maximum position of dirty space in
      a block, since we need only to know the dirty range, not exact position of
      dirty pages.
      
      Why it was made?  Several reasons: at first glance it seems that
      vm_map_ram allocator concerns about fragmentation thus it uses bitmaps for
      finding free hole, but it is not true.  To avoid complexity seems it is
      better to use something simple, like min or max range values.  Secondly,
      code also becomes simpler, without iteration over bitmap, just comparing
      values in min and max macros.  Thirdly, bitmap occupies up to 1024 bits
      (4MB is a max size of a block).  Here I replaced the whole bitmap with two
      longs.
      
      Finally vm_unmap_aliases should be slightly faster and the whole
      vmap_block structure occupies less memory.
      Signed-off-by: default avatarRoman Pen <r.peniaev@gmail.com>
      Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
      Cc: Eric Dumazet <edumazet@google.com>
      Acked-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: WANG Chao <chaowang@redhat.com>
      Cc: Fabian Frederick <fabf@skynet.be>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Gioh Kim <gioh.kim@lge.com>
      Cc: Rob Jones <rob.jones@codethink.co.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7d61bfe8
    • Roman Pen's avatar
      mm/vmalloc: occupy newly allocated vmap block just after allocation · cf725ce2
      Roman Pen authored
      Previous implementation allocates new vmap block and repeats search of a
      free block from the very beginning, iterating over the CPU free list.
      
      Why it can be better??
      
      1. Allocation can happen on one CPU, but search can be done on another CPU.
         In worst case we preallocate amount of vmap blocks which is equal to
         CPU number on the system.
      
      2. In previous patch I added newly allocated block to the tail of free list
         to avoid soon exhaustion of virtual space and give a chance to occupy
         blocks which were allocated long time ago.  Thus to find newly allocated
         block all the search sequence should be repeated, seems it is not efficient.
      
      In this patch newly allocated block is occupied right away, address of
      virtual space is returned to the caller, so there is no any need to repeat
      the search sequence, allocation job is done.
      Signed-off-by: default avatarRoman Pen <r.peniaev@gmail.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Eric Dumazet <edumazet@google.com>
      Acked-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: WANG Chao <chaowang@redhat.com>
      Cc: Fabian Frederick <fabf@skynet.be>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Gioh Kim <gioh.kim@lge.com>
      Cc: Rob Jones <rob.jones@codethink.co.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cf725ce2
    • Roman Pen's avatar
      mm/vmalloc: fix possible exhaustion of vmalloc space caused by vm_map_ram allocator · 68ac546f
      Roman Pen authored
      Recently I came across high fragmentation of vm_map_ram allocator:
      vmap_block has free space, but still new blocks continue to appear.
      Further investigation showed that certain mapping/unmapping sequences
      can exhaust vmalloc space.  On small 32bit systems that's not a big
      problem, cause purging will be called soon on a first allocation failure
      (alloc_vmap_area), but on 64bit machines, e.g.  x86_64 has 45 bits of
      vmalloc space, that can be a disaster.
      
      1) I came up with a simple allocation sequence, which exhausts virtual
         space very quickly:
      
        while (iters) {
      
                      /* Map/unmap big chunk */
                      vaddr = vm_map_ram(pages, 16, -1, PAGE_KERNEL);
                      vm_unmap_ram(vaddr, 16);
      
                      /* Map/unmap small chunks.
                       *
                       * -1 for hole, which should be left at the end of each block
                       * to keep it partially used, with some free space available */
                      for (i = 0; i < (VMAP_BBMAP_BITS - 16) / 8 - 1; i++) {
                              vaddr = vm_map_ram(pages, 8, -1, PAGE_KERNEL);
                              vm_unmap_ram(vaddr, 8);
                      }
        }
      
      The idea behind is simple:
      
       1. We have to map a big chunk, e.g. 16 pages.
      
       2. Then we have to occupy the remaining space with smaller chunks, i.e.
          8 pages. At the end small hole should remain to keep block in free list,
          but do not let big chunk to occupy remaining space.
      
       3. Goto 1 - allocation request of 16 pages can't be completed (only 8 slots
          are left free in the block in the #2 step), new block will be allocated,
          all further requests will lay into newly allocated block.
      
      To have some measurement numbers for all further tests I setup ftrace and
      enabled 4 basic calls in a function profile:
      
              echo vm_map_ram              > /sys/kernel/debug/tracing/set_ftrace_filter;
              echo alloc_vmap_area        >> /sys/kernel/debug/tracing/set_ftrace_filter;
              echo vm_unmap_ram           >> /sys/kernel/debug/tracing/set_ftrace_filter;
              echo free_vmap_block        >> /sys/kernel/debug/tracing/set_ftrace_filter;
      
      So for this scenario I got these results:
      
      BEFORE (all new blocks are put to the head of a free list)
      # cat /sys/kernel/debug/tracing/trace_stat/function0
        Function                               Hit    Time            Avg             s^2
        --------                               ---    ----            ---             ---
        vm_map_ram                          126000    30683.30 us     0.243 us        30819.36 us
        vm_unmap_ram                        126000    22003.24 us     0.174 us        340.886 us
        alloc_vmap_area                       1000    4132.065 us     4.132 us        0.903 us
      
      AFTER (all new blocks are put to the tail of a free list)
      # cat /sys/kernel/debug/tracing/trace_stat/function0
        Function                               Hit    Time            Avg             s^2
        --------                               ---    ----            ---             ---
        vm_map_ram                          126000    28713.13 us     0.227 us        24944.70 us
        vm_unmap_ram                        126000    20403.96 us     0.161 us        1429.872 us
        alloc_vmap_area                        993    3916.795 us     3.944 us        29.370 us
        free_vmap_block                        992    654.157 us      0.659 us        1.273 us
      
      SUMMARY:
      
      The most interesting numbers in those tables are numbers of block
      allocations and deallocations: alloc_vmap_area and free_vmap_block
      calls, which show that before the change blocks were not freed, and
      virtual space and physical memory (vmap_block structure allocations,
      etc) were consumed.
      
      Average time which were spent in vm_map_ram/vm_unmap_ram became slightly
      better.  That can be explained with a reasonable amount of blocks in a
      free list, which we need to iterate to find a suitable free block.
      
      2) Another scenario is a random allocation:
      
        while (iters) {
      
                      /* Randomly take number from a range [1..32/64] */
                      nr = rand(1, VMAP_MAX_ALLOC);
                      vaddr = vm_map_ram(pages, nr, -1, PAGE_KERNEL);
                      vm_unmap_ram(vaddr, nr);
        }
      
      I chose mersenne twister PRNG to generate persistent random state to
      guarantee that both runs have the same random sequence.  For each
      vm_map_ram call random number from [1..32/64] was taken to represent
      amount of pages which I do map.
      
      I did 10'000 vm_map_ram calls and got these two tables:
      
      BEFORE (all new blocks are put to the head of a free list)
      
      # cat /sys/kernel/debug/tracing/trace_stat/function0
        Function                               Hit    Time            Avg             s^2
        --------                               ---    ----            ---             ---
        vm_map_ram                           10000    10170.01 us     1.017 us        993.609 us
        vm_unmap_ram                         10000    5321.823 us     0.532 us        59.789 us
        alloc_vmap_area                        420    2150.239 us     5.119 us        3.307 us
        free_vmap_block                         37    159.587 us      4.313 us        134.344 us
      
      AFTER (all new blocks are put to the tail of a free list)
      
      # cat /sys/kernel/debug/tracing/trace_stat/function0
        Function                               Hit    Time            Avg             s^2
        --------                               ---    ----            ---             ---
        vm_map_ram                           10000    7745.637 us     0.774 us        395.229 us
        vm_unmap_ram                         10000    5460.573 us     0.546 us        67.187 us
        alloc_vmap_area                        414    2201.650 us     5.317 us        5.591 us
        free_vmap_block                        412    574.421 us      1.394 us        15.138 us
      
      SUMMARY:
      
      'BEFORE' table shows, that 420 blocks were allocated and only 37 were
      freed.  Remained 383 blocks are still in a free list, consuming virtual
      space and physical memory.
      
      'AFTER' table shows, that 414 blocks were allocated and 412 were really
      freed.  2 blocks remained in a free list.
      
      So fragmentation was dramatically reduced.  Why? Because when we put
      newly allocated block to the head, all further requests will occupy new
      block, regardless remained space in other blocks.  In this scenario all
      requests come randomly.  Eventually remained free space will be less
      than requested size, free list will be iterated and it is possible that
      nothing will be found there - finally new block will be created.  So
      exhaustion in random scenario happens for the maximum possible
      allocation size: 32 pages for 32-bit system and 64 pages for 64-bit
      system.
      
      Also average cost of vm_map_ram was reduced from 1.017 us to 0.774 us.
      Again this can be explained by iteration through smaller list of free
      blocks.
      
      3) Next simple scenario is a sequential allocation, when the allocation
         order is increased for each block.  This scenario forces allocator to
         reach maximum amount of partially free blocks in a free list:
      
        while (iters) {
      
                      /* Populate free list with blocks with remaining space */
                      for (order = 0; order <= ilog2(VMAP_MAX_ALLOC); order++) {
                              nr = VMAP_BBMAP_BITS / (1 << order);
      
                              /* Leave a hole */
                              nr -= 1;
      
                              for (i = 0; i < nr; i++) {
                                      vaddr = vm_map_ram(pages, (1 << order), -1, PAGE_KERNEL);
                                      vm_unmap_ram(vaddr, (1 << order));
                      }
      
                      /* Completely occupy blocks from a free list */
                      for (order = 0; order <= ilog2(VMAP_MAX_ALLOC); order++) {
                              vaddr = vm_map_ram(pages, (1 << order), -1, PAGE_KERNEL);
                              vm_unmap_ram(vaddr, (1 << order));
                      }
        }
      
      Results which I got:
      
      BEFORE (all new blocks are put to the head of a free list)
      
      # cat /sys/kernel/debug/tracing/trace_stat/function0
        Function                               Hit    Time            Avg             s^2
        --------                               ---    ----            ---             ---
        vm_map_ram                         2032000    399545.2 us     0.196 us        467123.7 us
        vm_unmap_ram                       2032000    363225.7 us     0.178 us        111405.9 us
        alloc_vmap_area                       7001    30627.76 us     4.374 us        495.755 us
        free_vmap_block                       6993    7011.685 us     1.002 us        159.090 us
      
      AFTER (all new blocks are put to the tail of a free list)
      
      # cat /sys/kernel/debug/tracing/trace_stat/function0
        Function                               Hit    Time            Avg             s^2
        --------                               ---    ----            ---             ---
        vm_map_ram                         2032000    394259.7 us     0.194 us        589395.9 us
        vm_unmap_ram                       2032000    292500.7 us     0.143 us        94181.08 us
        alloc_vmap_area                       7000    31103.11 us     4.443 us        703.225 us
        free_vmap_block                       7000    6750.844 us     0.964 us        119.112 us
      
      SUMMARY:
      
      No surprises here, almost all numbers are the same.
      
      Fixing this fragmentation problem I also did some improvements in a
      allocation logic of a new vmap block: occupy block immediately and get
      rid of extra search in a free list.
      
      Also I replaced dirty bitmap with min/max dirty range values to make the
      logic simpler and slightly faster, since two longs comparison costs
      less, than loop thru bitmap.
      
      This patchset raises several questions:
      
       Q: Think the problem you comments is already known so that I wrote comments
          about it as "it could consume lots of address space through fragmentation".
          Could you tell me about your situation and reason why it should be avoided?
                                                                           Gioh Kim
      
       A: Indeed, there was a commit 36437638 which adds explicit comment about
          fragmentation.  But fragmentation which is described in this comment caused
          by mixing of long-lived and short-lived objects, when a whole block is pinned
          in memory because some page slots are still in use.  But here I am talking
          about blocks which are free, nobody uses them, and allocator keeps them alive
          forever, continuously allocating new blocks.
      
       Q: I think that if you put newly allocated block to the tail of a free
          list, below example would results in enormous performance degradation.
      
          new block: 1MB (256 pages)
      
          while (iters--) {
            vm_map_ram(3 or something else not dividable for 256) * 85
            vm_unmap_ram(3) * 85
          }
      
          On every iteration, it needs newly allocated block and it is put to the
          tail of a free list so finding it consumes large amount of time.
                                                                          Joonsoo Kim
      
       A: Second patch in current patchset gets rid of extra search in a free list,
          so new block will be immediately occupied..
      
          Also, the scenario above is impossible, cause vm_map_ram allocates virtual
          range in orders, i.e. 2^n.  I.e. passing 3 to vm_map_ram you will allocate
          4 slots in a block and 256 slots (capacity of a block) of course dividable
          on 4, so block will be completely occupied.
      
          But there is a worst case which we can achieve: each free block has a hole
          equal to order size.
      
          The maximum size of allocation is 64 pages for 64-bit system
          (if you try to map more, original alloc_vmap_area will be called).
      
          So the maximum order is 6.  That means that worst case, before allocator
          makes a decision to allocate a new block, is to iterate 7 blocks:
      
          HEAD
          1st block - has 1  page slot  free (order 0)
          2nd block - has 2  page slots free (order 1)
          3rd block - has 4  page slots free (order 2)
          4th block - has 8  page slots free (order 3)
          5th block - has 16 page slots free (order 4)
          6th block - has 32 page slots free (order 5)
          7th block - has 64 page slots free (order 6)
          TAIL
      
          So the worst scenario on 64-bit system is that each CPU queue can have 7
          blocks in a free list.
      
          This can happen only and only if you allocate blocks increasing the order.
          (as I did in the function written in the comment of the first patch)
          This is weird and rare case, but still it is possible.  Afterwards you will
          get 7 blocks in a list.
      
          All further requests should be placed in a newly allocated block or some
          free slots should be found in a free list.
          Seems it does not look dramatically awful.
      
      This patch (of 3):
      
      If suitable block can't be found, new block is allocated and put into a
      head of a free list, so on next iteration this new block will be found
      first.
      
      That's bad, because old blocks in a free list will not get a chance to be
      fully used, thus fragmentation will grow.
      
      Let's consider this simple example:
      
       #1 We have one block in a free list which is partially used, and where only
          one page is free:
      
          HEAD |xxxxxxxxx-| TAIL
                         ^
                         free space for 1 page, order 0
      
       #2 New allocation request of order 1 (2 pages) comes, new block is allocated
          since we do not have free space to complete this request. New block is put
          into a head of a free list:
      
          HEAD |----------|xxxxxxxxx-| TAIL
      
       #3 Two pages were occupied in a new found block:
      
          HEAD |xx--------|xxxxxxxxx-| TAIL
                ^
                two pages mapped here
      
       #4 New allocation request of order 0 (1 page) comes.  Block, which was created
          on #2 step, is located at the beginning of a free list, so it will be found
          first:
      
        HEAD |xxX-------|xxxxxxxxx-| TAIL
                ^                 ^
                page mapped here, but better to use this hole
      
      It is obvious, that it is better to complete request of #4 step using the
      old block, where free space is left, because in other case fragmentation
      will be highly increased.
      
      But fragmentation is not only the case.  The worst thing is that I can
      easily create scenario, when the whole vmalloc space is exhausted by
      blocks, which are not used, but already dirty and have several free pages.
      
      Let's consider this function which execution should be pinned to one CPU:
      
      static void exhaust_virtual_space(struct page *pages[16], int iters)
      {
              /* Firstly we have to map a big chunk, e.g. 16 pages.
               * Then we have to occupy the remaining space with smaller
               * chunks, i.e. 8 pages. At the end small hole should remain.
               * So at the end of our allocation sequence block looks like
               * this:
               *                XX  big chunk
               * |XXxxxxxxx-|    x  small chunk
               *                 -  hole, which is enough for a small chunk,
               *                    but is not enough for a big chunk
               */
              while (iters--) {
                      int i;
                      void *vaddr;
      
                      /* Map/unmap big chunk */
                      vaddr = vm_map_ram(pages, 16, -1, PAGE_KERNEL);
                      vm_unmap_ram(vaddr, 16);
      
                      /* Map/unmap small chunks.
                       *
                       * -1 for hole, which should be left at the end of each block
                       * to keep it partially used, with some free space available */
                      for (i = 0; i < (VMAP_BBMAP_BITS - 16) / 8 - 1; i++) {
                              vaddr = vm_map_ram(pages, 8, -1, PAGE_KERNEL);
                              vm_unmap_ram(vaddr, 8);
                      }
              }
      }
      
      On every iteration new block (1MB of vm area in my case) will be
      allocated and then will be occupied, without attempt to resolve small
      allocation request using previously allocated blocks in a free list.
      
      In case of random allocation (size should be randomly taken from the
      range [1..64] in 64-bit case or [1..32] in 32-bit case) situation is the
      same: new blocks continue to appear if maximum possible allocation size
      (32 or 64) passed to the allocator, because all remaining blocks in a
      free list do not have enough free space to complete this allocation
      request.
      
      In summary if new blocks are put into the head of a free list eventually
      virtual space will be exhausted.
      
      In current patch I simply put newly allocated block to the tail of a
      free list, thus reduce fragmentation, giving a chance to resolve
      allocation request using older blocks with possible holes left.
      Signed-off-by: default avatarRoman Pen <r.peniaev@gmail.com>
      Cc: Eric Dumazet <edumazet@google.com>
      Acked-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: WANG Chao <chaowang@redhat.com>
      Cc: Fabian Frederick <fabf@skynet.be>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Gioh Kim <gioh.kim@lge.com>
      Cc: Rob Jones <rob.jones@codethink.co.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      68ac546f
    • Mike Kravetz's avatar
      hugetlbfs: document min_size mount option and cleanup · 8c9b9703
      Mike Kravetz authored
      Add min_size mount option to the hugetlbfs documentation.  Also, add the
      missing pagesize option and mention that size can be specified as bytes or
      a percentage of huge page pool.
      Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
      Cc: Davidlohr Bueso <dave@stgolabs.net>
      Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8c9b9703
    • Mike Kravetz's avatar
      hugetlbfs: accept subpool min_size mount option and setup accordingly · 7ca02d0a
      Mike Kravetz authored
      Make 'min_size=<value>' be an option when mounting a hugetlbfs.  This
      option takes the same value as the 'size' option.  min_size can be
      specified without specifying size.  If both are specified, min_size must
      be less that or equal to size else the mount will fail.  If min_size is
      specified, then at mount time an attempt is made to reserve min_size
      pages.  If the reservation fails, the mount fails.  At umount time, the
      reserved pages are released.
      Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
      Cc: Davidlohr Bueso <dave@stgolabs.net>
      Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7ca02d0a
    • Mike Kravetz's avatar
      hugetlbfs: add minimum size accounting to subpools · 1c5ecae3
      Mike Kravetz authored
      The same routines that perform subpool maximum size accounting
      hugepage_subpool_get/put_pages() are modified to also perform minimum size
      accounting.  When a delta value is passed to these routines, calculate how
      global reservations must be adjusted to maintain the subpool minimum size.
       The routines now return this global reserve count adjustment.  This
      global reserve count adjustment is then passed to the global accounting
      routine hugetlb_acct_memory().
      Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
      Cc: Davidlohr Bueso <dave@stgolabs.net>
      Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1c5ecae3
    • Mike Kravetz's avatar
      hugetlbfs: add minimum size tracking fields to subpool structure · c6a91820
      Mike Kravetz authored
      hugetlbfs allocates huge pages from the global pool as needed.  Even if
      the global pool contains a sufficient number pages for the filesystem size
      at mount time, those global pages could be grabbed for some other use.  As
      a result, filesystem huge page allocations may fail due to lack of pages.
      
      Applications such as a database want to use huge pages for performance
      reasons.  hugetlbfs filesystem semantics with ownership and modes work
      well to manage access to a pool of huge pages.  However, the application
      would like some reasonable assurance that allocations will not fail due to
      a lack of huge pages.  At application startup time, the application would
      like to configure itself to use a specific number of huge pages.  Before
      starting, the application can check to make sure that enough huge pages
      exist in the system global pools.  However, there are no guarantees that
      those pages will be available when needed by the application.  What the
      application wants is exclusive use of a subset of huge pages.
      
      Add a new hugetlbfs mount option 'min_size=<value>' to indicate that the
      specified number of pages will be available for use by the filesystem.  At
      mount time, this number of huge pages will be reserved for exclusive use
      of the filesystem.  If there is not a sufficient number of free pages, the
      mount will fail.  As pages are allocated to and freeed from the
      filesystem, the number of reserved pages is adjusted so that the specified
      minimum is maintained.
      
      This patch (of 4):
      
      Add a field to the subpool structure to indicate the minimimum number of
      huge pages to always be used by this subpool.  This minimum count includes
      allocated pages as well as reserved pages.  If the minimum number of pages
      for the subpool have not been allocated, pages are reserved up to this
      minimum.  An additional field (rsv_hpages) is used to track the number of
      pages reserved to meet this minimum size.  The hstate pointer in the
      subpool is convenient to have when reserving and unreserving the pages.
      Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
      Cc: Davidlohr Bueso <dave@stgolabs.net>
      Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c6a91820
    • Gioh Kim's avatar
      mm/compaction: reset compaction scanner positions · 195b0c60
      Gioh Kim authored
      When the compaction is activated via /proc/sys/vm/compact_memory it would
      better scan the whole zone.  And some platforms, for instance ARM, have
      the start_pfn of a zone at zero.  Therefore the first try to compact via
      /proc doesn't work.  It needs to reset the compaction scanner position
      first.
      Signed-off-by: default avatarGioh Kim <gioh.kim@lge.com>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      195b0c60
    • Michal Hocko's avatar
      mm, memcg: sync allocation and memcg charge gfp flags for THP · 3b363692
      Michal Hocko authored
      memcg currently uses hardcoded GFP_TRANSHUGE gfp flags for all THP
      charges.  THP allocations, however, might be using different flags
      depending on /sys/kernel/mm/transparent_hugepage/{,khugepaged/}defrag and
      the current allocation context.
      
      The primary difference is that defrag configured to "madvise" value will
      clear __GFP_WAIT flag from the core gfp mask to make the allocation
      lighter for all mappings which are not backed by VM_HUGEPAGE vmas.  If
      memcg charge path ignores this fact we will get light allocation but the a
      potential memcg reclaim would kill the whole point of the configuration.
      
      Fix the mismatch by providing the same gfp mask used for the allocation to
      the charge functions.  This is quite easy for all paths except for
      hugepaged kernel thread with !CONFIG_NUMA which is doing a pre-allocation
      long before the allocated page is used in collapse_huge_page via
      khugepaged_alloc_page.  To prevent from cluttering the whole code path
      from khugepaged_do_scan we simply return the current flags as per
      khugepaged_defrag() value which might have changed since the
      preallocation.  If somebody changed the value of the knob we would charge
      differently but this shouldn't happen often and it is definitely not
      critical because it would only lead to a reduced success rate of one-off
      THP promotion.
      
      [akpm@linux-foundation.org: fix weird code layout while we're there]
      [rientjes@google.com: clean up around alloc_hugepage_gfpmask()]
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3b363692
    • Minchan Kim's avatar
      mm: rename deactivate_page to deactivate_file_page · cc5993bd
      Minchan Kim authored
      "deactivate_page" was created for file invalidation so it has too
      specific logic for file-backed pages.  So, let's change the name of the
      function and date to a file-specific one and yield the generic name.
      Signed-off-by: default avatarMinchan Kim <minchan@kernel.org>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Shaohua Li <shli@kernel.org>
      Cc: Wang, Yalin <Yalin.Wang@sonymobile.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cc5993bd
    • Eric B Munson's avatar
      Documentation/vm/unevictable-lru.txt: document interaction between compaction... · 922c0551
      Eric B Munson authored
      Documentation/vm/unevictable-lru.txt: document interaction between compaction and the unevictable LRU
      
      The memory compaction code uses the migration code to do most of the
      work in compaction.  However, the compaction code interacts with the
      unevictable LRU differently than migration code and this difference
      should be noted in the documentation.
      
      [akpm@linux-foundation.org: identify /proc/sys/vm/compact_unevictable directly]
      Signed-off-by: default avatarEric B Munson <emunson@akamai.com>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Mel Gorman <mgorman@suse.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      922c0551
    • Eric B Munson's avatar
      mm: allow compaction of unevictable pages · 5bbe3547
      Eric B Munson authored
      Currently, pages which are marked as unevictable are protected from
      compaction, but not from other types of migration.  The POSIX real time
      extension explicitly states that mlock() will prevent a major page
      fault, but the spirit of this is that mlock() should give a process the
      ability to control sources of latency, including minor page faults.
      However, the mlock manpage only explicitly says that a locked page will
      not be written to swap and this can cause some confusion.  The
      compaction code today does not give a developer who wants to avoid swap
      but wants to have large contiguous areas available any method to achieve
      this state.  This patch introduces a sysctl for controlling compaction
      behavior with respect to the unevictable lru.  Users who demand no page
      faults after a page is present can set compact_unevictable_allowed to 0
      and users who need the large contiguous areas can enable compaction on
      locked memory by leaving the default value of 1.
      
      To illustrate this problem I wrote a quick test program that mmaps a
      large number of 1MB files filled with random data.  These maps are
      created locked and read only.  Then every other mmap is unmapped and I
      attempt to allocate huge pages to the static huge page pool.  When the
      compact_unevictable_allowed sysctl is 0, I cannot allocate hugepages
      after fragmenting memory.  When the value is set to 1, allocations
      succeed.
      Signed-off-by: default avatarEric B Munson <emunson@akamai.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Acked-by: default avatarChristoph Lameter <cl@linux.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Acked-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Michal Hocko <mhocko@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5bbe3547
    • Naoya Horiguchi's avatar
      mm/page-writeback: check-before-clear PageReclaim · a4bb3ecd
      Naoya Horiguchi authored
      With the page flag sanitization patchset, an invalid usage of
      ClearPageReclaim() is detected in set_page_dirty().  This can be called
      from __unmap_hugepage_range(), so let's check PageReclaim() before trying
      to clear it to avoid the misuse.
      Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a4bb3ecd
    • Naoya Horiguchi's avatar
      mm/migrate: check-before-clear PageSwapCache · b3b3a99c
      Naoya Horiguchi authored
      With the page flag sanitization patchset, an invalid usage of
      ClearPageSwapCache() is detected in migration_page_copy().
      migrate_page_copy() is shared by both normal and hugepage (both thp and
      hugetlb) code path, so let's check PageSwapCache() and clear it if it's
      set to avoid misuse of the invalid clear operation.
      Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b3b3a99c
    • Kirill A. Shutemov's avatar
      mm: avoid tail page refcounting on non-THP compound pages · 8d63d99a
      Kirill A. Shutemov authored
      THP uses tail page refcounting to be able to split huge pages at any time.
       Tail page refcounting is not needed for other users of compound pages and
      it's harmful because of overhead.
      
      We try to exclude non-THP pages from tail page refcounting using
      __compound_tail_refcounted() check.  It excludes most common non-THP
      compound pages: SL*B and hugetlb, but it doesn't catch rest of __GFP_COMP
      users -- drivers.
      
      And it's not only about overhead.
      
      Drivers might want to use compound pages to get refcounting semantics
      suitable for mapping high-order pages to userspace.  But tail page
      refcounting breaks it.
      
      Tail page refcounting uses ->_mapcount in tail pages to store GUP pins on
      them.  It means GUP pins would affect page_mapcount() for tail pages.
      It's not a problem for THP, because it never maps tail pages.  But unlike
      THP, drivers map parts of compound pages with PTEs and it makes
      page_mapcount() be called for tail pages.
      
      In particular, GUP pins would shift PSS up and affect /proc/kpagecount for
      such pages.  But, I'm not aware about anything which can lead to crash or
      other serious misbehaviour.
      
      Since currently all THP pages are anonymous and all drivers pages are not,
      we can fix the __compound_tail_refcounted() check by requiring PageAnon()
      to enable tail page refcounting.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Acked-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d63d99a
    • Kirill A. Shutemov's avatar
      mm: consolidate all page-flags helpers in <linux/page-flags.h> · e8c6158f
      Kirill A. Shutemov authored
      Currently we take a naive approach to page flags on compound pages - we
      set the flag on the page without consideration if the flag makes sense
      for tail page or for compound page in general.  This patchset try to
      sort this out by defining per-flag policy on what need to be done if
      page-flag helper operate on compound page.
      
      The last patch in the patchset also sanitizes usege of page->mapping for
      tail pages.  We don't define the meaning of page->mapping for tail
      pages.  Currently it's always NULL, which can be inconsistent with head
      page and potentially lead to problems.
      
      For now I caught one case of illegal usage of page flags or ->mapping:
      sound subsystem allocates pages with __GFP_COMP and maps them with PTEs.
      It leads to setting dirty bit on tail pages and access to tail_page's
      ->mapping.  I don't see any bad behaviour caused by this, but worth
      fixing anyway.
      
      This patchset makes more sense if you take my THP refcounting into
      account: we will see more compound pages mapped with PTEs and we need to
      define behaviour of flags on compound pages to avoid bugs.
      
      This patch (of 16):
      
      We have page-flags helper function declarations/definitions spread over
      several header files.  Let's consolidate them in <linux/page-flags.h>.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Acked-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Steve Capper <steve.capper@linaro.org>
      Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Jerome Marchand <jmarchan@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e8c6158f
    • Naoya Horiguchi's avatar
      mm/memory-failure.c: define page types for action_result() in one place · 64d37a2b
      Naoya Horiguchi authored
      This cleanup patch moves all strings passed to action_result() into a
      singl= e array action_page_type so that a reader can easily find which
      kind of actio= n results are possible.  And this patch also fixes the
      odd lines to be printed out, like "unknown page state page" or "free
      buddy, 2nd try page".
      
      [akpm@linux-foundation.org: rename messages, per David]
      [akpm@linux-foundation.org: s/DIRTY_UNEVICTABLE_LRU/CLEAN_UNEVICTABLE_LRU', per Andi]
      Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Reviewed-by: default avatarAndi Kleen <ak@linux.intel.com>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: "Xie XiuQi" <xiexiuqi@huawei.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Chen Gong <gong.chen@linux.intel.com>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      64d37a2b
    • Vladimir Davydov's avatar
      memcg: remove obsolete comment · 2564f683
      Vladimir Davydov authored
      Low and high watermarks, as they defined in the TODO to the mem_cgroup
      struct, have already been implemented by Johannes, so remove the stale
      comment.
      Signed-off-by: default avatarVladimir Davydov <vdavydov@parallels.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2564f683
    • Vladimir Davydov's avatar
      memcg: zap mem_cgroup_lookup() · adbe427b
      Vladimir Davydov authored
      mem_cgroup_lookup() is a wrapper around mem_cgroup_from_id(), which
      checks that id != 0 before issuing the function call.  Today, there is
      no point in this additional check apart from optimization, because there
      is no css with id <= 0, so that css_from_id, called by
      mem_cgroup_from_id, will return NULL for any id <= 0.
      
      Since mem_cgroup_from_id is only called from mem_cgroup_lookup, let us
      zap mem_cgroup_lookup, substituting calls to it with mem_cgroup_from_id
      and moving the check if id > 0 to css_from_id.
      Signed-off-by: default avatarVladimir Davydov <vdavydov@parallels.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      adbe427b
    • Zhang Zhen's avatar
      mm: refactor zone_movable_is_highmem() · d7e4a2ea
      Zhang Zhen authored
      All callers of zone_movable_is_highmem are under #ifdef CONFIG_HIGHMEM,
      so the else branch return 0 is not needed.
      Signed-off-by: default avatarZhang Zhen <zhenzhang.zhang@huawei.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d7e4a2ea
    • Yaowei Bai's avatar
      mm/oom_kill.c: fix typo in comment · bdddbcd4
      Yaowei Bai authored
      Alter 'taks' -> 'task'
      Signed-off-by: default avatarYaowei Bai <bywxiaobai@163.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bdddbcd4
    • Zhang Zhen's avatar
      vfs: delete vfs_readdir function declaration · f2b91d8d
      Zhang Zhen authored
      vfs_readdir() was replaced by iterate_dir() in commit 5c0ba4e0
      ("[readdir] introduce iterate_dir() and dir_context").
      Signed-off-by: default avatarZhang Zhen <zhenzhang.zhang@huawei.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f2b91d8d
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next · 6c373ca8
      Linus Torvalds authored
      Pull networking updates from David Miller:
      
       1) Add BQL support to via-rhine, from Tino Reichardt.
      
       2) Integrate SWITCHDEV layer support into the DSA layer, so DSA drivers
          can support hw switch offloading.  From Floria Fainelli.
      
       3) Allow 'ip address' commands to initiate multicast group join/leave,
          from Madhu Challa.
      
       4) Many ipv4 FIB lookup optimizations from Alexander Duyck.
      
       5) Support EBPF in cls_bpf classifier and act_bpf action, from Daniel
          Borkmann.
      
       6) Remove the ugly compat support in ARP for ugly layers like ax25,
          rose, etc.  And use this to clean up the neigh layer, then use it to
          implement MPLS support.  All from Eric Biederman.
      
       7) Support L3 forwarding offloading in switches, from Scott Feldman.
      
       8) Collapse the LOCAL and MAIN ipv4 FIB tables when possible, to speed
          up route lookups even further.  From Alexander Duyck.
      
       9) Many improvements and bug fixes to the rhashtable implementation,
          from Herbert Xu and Thomas Graf.  In particular, in the case where
          an rhashtable user bulk adds a large number of items into an empty
          table, we expand the table much more sanely.
      
      10) Don't make the tcp_metrics hash table per-namespace, from Eric
          Biederman.
      
      11) Extend EBPF to access SKB fields, from Alexei Starovoitov.
      
      12) Split out new connection request sockets so that they can be
          established in the main hash table.  Much less false sharing since
          hash lookups go direct to the request sockets instead of having to
          go first to the listener then to the request socks hashed
          underneath.  From Eric Dumazet.
      
      13) Add async I/O support for crytpo AF_ALG sockets, from Tadeusz Struk.
      
      14) Support stable privacy address generation for RFC7217 in IPV6.  From
          Hannes Frederic Sowa.
      
      15) Hash network namespace into IP frag IDs, also from Hannes Frederic
          Sowa.
      
      16) Convert PTP get/set methods to use 64-bit time, from Richard
          Cochran.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1816 commits)
        fm10k: Bump driver version to 0.15.2
        fm10k: corrected VF multicast update
        fm10k: mbx_update_max_size does not drop all oversized messages
        fm10k: reset head instead of calling update_max_size
        fm10k: renamed mbx_tx_dropped to mbx_tx_oversized
        fm10k: update xcast mode before synchronizing multicast addresses
        fm10k: start service timer on probe
        fm10k: fix function header comment
        fm10k: comment next_vf_mbx flow
        fm10k: don't handle mailbox events in iov_event path and always process mailbox
        fm10k: use separate workqueue for fm10k driver
        fm10k: Set PF queues to unlimited bandwidth during virtualization
        fm10k: expose tx_timeout_count as an ethtool stat
        fm10k: only increment tx_timeout_count in Tx hang path
        fm10k: remove extraneous "Reset interface" message
        fm10k: separate PF only stats so that VF does not display them
        fm10k: use hw->mac.max_queues for stats
        fm10k: only show actual queues, not the maximum in hardware
        fm10k: allow creation of VLAN on default vid
        fm10k: fix unused warnings
        ...
      6c373ca8
  2. 14 Apr, 2015 17 commits
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm · bb0fd7ab
      Linus Torvalds authored
      Pull ARM updates from Russell King:
       "Included in this update are both some long term fixes and some new
        features.
      
        Fixes:
      
         - An integer overflow in the calculation of ELF_ET_DYN_BASE.
      
         - Avoiding OOMs for high-order IOMMU allocations
      
         - SMP requires the data cache to be enabled for synchronisation
           primitives to work, so prevent the CPU_DCACHE_DISABLE option being
           visible on SMP builds.
      
         - A bug going back 10+ years in the noMMU ARM94* CPU support code,
           where it corrupts registers.  Found by folk getting Linux running
           on their cameras.
      
         - Versatile Express needs an errata workaround enabled for CPU
           hot-unplug to work.
      
        Features:
      
         - Clean up module linker by handling out of range relocations
           separately from relocation cases we don't handle.
      
         - Fix a long term bug in the pci_mmap_page_range() code, which we
           hope won't impact userspace (we hope there's no users of the
           existing broken interface.)
      
         - Don't map DMA coherent allocations when we don't have a MMU.
      
         - Drop experimental status for SMP_ON_UP.
      
         - Warn when DT doesn't specify ePAPR mandatory cache properties.
      
         - Add documentation concerning how we find the start of physical
           memory for AUTO_ZRELADDR kernels, detailing why we have chosen the
           mask and the implications of changing it.
      
         - Updates from Ard Biesheuvel to address some issues with large
           kernels (such as allyesconfig) failing to link.
      
         - Allow hibernation to work on modern (ARMv7) CPUs - this appears to
           have never worked in the past on these CPUs.
      
         - Enable IRQ_SHOW_LEVEL, which changes the /proc/interrupts output
           format (hopefully without userspace breaking...  let's hope that if
           it causes someone a problem, they tell us.)
      
         - Fix tegra-ahb DT offsets.
      
         - Rework ARM errata 643719 code (and ARMv7 flush_cache_louis()/
           flush_dcache_all()) code to be more efficient, and enable this
           errata workaround by default for ARMv7+SMP CPUs.  This complements
           the Versatile Express fix above.
      
         - Rework ARMv7 context code for errata 430973, so that only Cortex A8
           CPUs are impacted by the branch target buffer flush when this
           errata is enabled.  Also update the help text to indicate that all
           r1p* A8 CPUs are impacted.
      
         - Switch ARM to the generic show_mem() implementation, it conveys all
           the information which we were already reporting.
      
         - Prevent slow timer sources being used for udelay() - timers running
           at less than 1MHz are not useful for this, and can cause udelay()
           to return immediately, without any wait.  Using such a slow timer
           is silly.
      
         - VDSO support for 32-bit ARM, mainly for gettimeofday() using the
           ARM architected timer.
      
         - Perf support for Scorpion performance monitoring units"
      
      vdso semantic conflict fixed up as per linux-next.
      
      * 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (52 commits)
        ARM: update errata 430973 documentation to cover Cortex A8 r1p*
        ARM: ensure delay timer has sufficient accuracy for delays
        ARM: switch to use the generic show_mem() implementation
        ARM: proc-v7: avoid errata 430973 workaround for non-Cortex A8 CPUs
        ARM: enable ARM errata 643719 workaround by default
        ARM: cache-v7: optimise test for Cortex A9 r0pX devices
        ARM: cache-v7: optimise branches in v7_flush_cache_louis
        ARM: cache-v7: consolidate initialisation of cache level index
        ARM: cache-v7: shift CLIDR to extract appropriate field before masking
        ARM: cache-v7: use movw/movt instructions
        ARM: allow 16-bit instructions in ALT_UP()
        ARM: proc-arm94*.S: fix setup function
        ARM: vexpress: fix CPU hotplug with CT9x4 tile.
        ARM: 8276/1: Make CPU_DCACHE_DISABLE depend on !SMP
        ARM: 8335/1: Documentation: DT bindings: Tegra AHB: document the legacy base address
        ARM: 8334/1: amba: tegra-ahb: detect and correct bogus base address
        ARM: 8333/1: amba: tegra-ahb: fix register offsets in the macros
        ARM: 8339/1: Enable CONFIG_GENERIC_IRQ_SHOW_LEVEL
        ARM: 8338/1: kexec: Relax SMP validation to improve DT compatibility
        ARM: 8337/1: mm: Do not invoke OOM for higher order IOMMU DMA allocations
        ...
      bb0fd7ab
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux · bdfa54df
      Linus Torvalds authored
      Pull s390 updates from Martin Schwidefsky:
       "The major change in this merge is the removal of the support for
        31-bit kernels.  Naturally 31-bit user space will continue to work via
        the compat layer.
      
        And then some cleanup, some improvements and bug fixes"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (23 commits)
        s390/smp: wait until secondaries are active & online
        s390/hibernate: fix save and restore of kernel text section
        s390/cacheinfo: add missing facility check
        s390/syscalls: simplify syscall_get_arch()
        s390/irq: enforce correct irqclass_sub_desc array size
        s390: remove "64" suffix from mem64.S and swsusp_asm64.S
        s390/ipl: cleanup macro usage
        s390/ipl: cleanup shutdown_action attributes
        s390/ipl: cleanup bin attr usage
        s390/uprobes: fix address space annotation
        s390: add missing arch_release_task_struct() declaration
        s390: make couple of functions and variables static
        s390/maccess: improve s390_kernel_write()
        s390/maccess: remove potentially broken probe_kernel_write()
        s390/watchdog: support for KVM hypervisors and delete pr_info messages
        s390/watchdog: enable KEEPALIVE for /dev/watchdog
        s390/dasd: remove setting of scheduler from driver
        s390/traps: panic() instead of die() on translation exception
        s390: remove test_facility(2) (== z/Architecture mode active) checks
        s390/cmpxchg: simplify cmpxchg_double
        ...
      bdfa54df
    • Linus Torvalds's avatar
      Merge tag 'pm+acpi-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 2481bc75
      Linus Torvalds authored
      Pull power management and ACPI updates from Rafael Wysocki:
       "These are mostly fixes and cleanups all over, although there are a few
        items that sort of fall into the new feature category.
      
        First off, we have new callbacks for PM domains that should help us to
        handle some issues related to device initialization in a better way.
      
        There also is some consolidation in the unified device properties API
        area allowing us to use that inferface for accessing data coming from
        platform initialization code in addition to firmware-provided data.
      
        We have some new device/CPU IDs in a few drivers, support for new
        chips and a new cpufreq driver too.
      
        Specifics:
      
         - Generic PM domains support update including new PM domain callbacks
           to handle device initialization better (Russell King, Rafael J
           Wysocki, Kevin Hilman)
      
         - Unified device properties API update including a new mechanism for
           accessing data provided by platform initialization code (Rafael J
           Wysocki, Adrian Hunter)
      
         - ARM cpuidle update including ARM32/ARM64 handling consolidation
           (Daniel Lezcano)
      
         - intel_idle update including support for the Silvermont Core in the
           Baytrail SOC and for the Airmont Core in the Cherrytrail and
           Braswell SOCs (Len Brown, Mathias Krause)
      
         - New cpufreq driver for Hisilicon ACPU (Leo Yan)
      
         - intel_pstate update including support for the Knights Landing chip
           (Dasaratharaman Chandramouli, Kristen Carlson Accardi)
      
         - QorIQ cpufreq driver update (Tang Yuantian, Arnd Bergmann)
      
         - powernv cpufreq driver update (Shilpasri G Bhat)
      
         - devfreq update including Tegra support changes (Tomeu Vizoso,
           MyungJoo Ham, Chanwoo Choi)
      
         - powercap RAPL (Running-Average Power Limit) driver update including
           support for Intel Broadwell server chips (Jacob Pan, Mathias Krause)
      
         - ACPI device enumeration update related to the handling of the
           special PRP0001 device ID allowing DT-style 'compatible' property
           to be used for ACPI device identification (Rafael J Wysocki)
      
         - ACPI EC driver update including limited _DEP support (Lan Tianyu,
           Lv Zheng)
      
         - ACPI backlight driver update including a new mechanism to allow
           native backlight handling to be forced on non-Windows 8 systems and
           a new quirk for Lenovo Ideapad Z570 (Aaron Lu, Hans de Goede)
      
         - New Windows Vista compatibility quirk for Sony VGN-SR19XN (Chen Yu)
      
         - Assorted ACPI fixes and cleanups (Aaron Lu, Martin Kepplinger,
           Masanari Iida, Mika Westerberg, Nan Li, Rafael J Wysocki)
      
         - Fixes related to suspend-to-idle for the iTCO watchdog driver and
           the ACPI core system suspend/resume code (Rafael J Wysocki, Chen Yu)
      
         - PM tracing support for the suspend phase of system suspend/resume
           transitions (Zhonghui Fu)
      
         - Configurable delay for the system suspend/resume testing facility
           (Brian Norris)
      
         - PNP subsystem cleanups (Peter Huewe, Rafael J Wysocki)"
      
      * tag 'pm+acpi-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (74 commits)
        ACPI / scan: Fix NULL pointer dereference in acpi_companion_match()
        ACPI / scan: Rework modalias creation when "compatible" is present
        intel_idle: mark cpu id array as __initconst
        powercap / RAPL: mark rapl_ids array as __initconst
        powercap / RAPL: add ID for Broadwell server
        intel_pstate: Knights Landing support
        intel_pstate: remove MSR test
        cpufreq: fix qoriq uniprocessor build
        ACPI / scan: Take the PRP0001 position in the list of IDs into account
        ACPI / scan: Simplify acpi_match_device()
        ACPI / scan: Generalize of_compatible matching
        device property: Introduce firmware node type for platform data
        device property: Make it possible to use secondary firmware nodes
        PM / watchdog: iTCO: stop watchdog during system suspend
        cpufreq: hisilicon: add acpu driver
        ACPI / EC: Call acpi_walk_dep_device_list() after installing EC opregion handler
        cpufreq: powernv: Report cpu frequency throttling
        intel_idle: Add support for the Airmont Core in the Cherrytrail and Braswell SOCs
        intel_idle: Update support for Silvermont Core in Baytrail SOC
        PM / devfreq: tegra: Register governor on module init
        ...
      2481bc75
    • David S. Miller's avatar
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue · 9f915141
      David S. Miller authored
      Jeff Kirsher says:
      
      ====================
      Intel Wired LAN Driver Updates 2015-04-14
      
      This series contains updates to fm10k only.
      
      Fixed transmit statistics which was actually using values from the
      receive ring, instead of the transmit ring.  Fixed up spelling mistakes
      in code comments and resolved unused argument warnings.  Added support
      for netconsole.  Fixed up statistic reporting so that we are only
      reporting from actual queues as well as display PF only stats for
      just the PF and not the VF.  Also fixed an issue that when returning
      virtualization queues from the VF back to the PF, we were retaining
      the VF rate limiter.
      
      Fixed up the driver to use a separate workqueue, which helps reduce
      and stabilize latency between scheduling the work in our interrupt and
      actually performing the work.
      
      Fixed a bug where the VF tried to set a multicast address before
      requesting the required xcast mode.
      
      Fix VF multicast update since VFs were being improperly added to the
      switch's mutlicast group.  The error stems from the fact that incorrect
      arguments were passed to the update_mc_addr().
      
      Thanks to Alex Duyck for the extensive review.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9f915141
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 8691c130
      Linus Torvalds authored
      Pull input subsystem updates from Dmitry Torokhov:
       "You will get the following new drivers:
      
         - Qualcomm PM8941 power key drver
         - ChipOne icn8318 touchscreen controller driver
         - Broadcom iProc touchscreen and keypad drivers
         - Semtech SX8654 I2C touchscreen controller driver
      
        ALPS driver now supports newer SS4 devices; Elantech got a fix that
        should make it work on some ASUS laptops; and a slew of other
        enhancements and random fixes"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (51 commits)
        Input: alps - non interleaved V2 dualpoint has separate stick button bits
        Input: alps - fix touchpad buttons getting stuck when used with trackpoint
        Input: atkbd - document "no new force-release quirks" policy
        Input: ALPS - make alps_get_pkt_id_ss4_v2() and others static
        Input: ALPS - V7 devices can report 5-finger taps
        Input: ALPS - add support for SS4 touchpad devices
        Input: ALPS - refactor alps_set_abs_params_mt()
        Input: elantech - fix absolute mode setting on some ASUS laptops
        Input: atmel_mxt_ts - split out touchpad initialisation logic
        Input: atmel_mxt_ts - implement support for T100 touch object
        Input: cros_ec_keyb - fix clearing keyboard state on wakeup
        Input: gscps2 - drop pci_ids dependency
        Input: synaptics - allocate 3 slots to keep stability in image sensors
        Input: Revert "Revert "synaptics - use dmax in input_mt_assign_slots""
        Input: MT - make slot assignment work for overcovered solutions
        mfd: tc3589x: enforce device-tree only mode
        Input: tc3589x - localize platform data
        Input: tsc2007 - Convert msecs to jiffies only once
        Input: edt-ft5x06 - remove EV_SYN event report
        Input: edt-ft5x06 - allow to setting the maximum axes value through the DT
        ...
      8691c130
    • Linus Torvalds's avatar
      Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux · c3a416a6
      Linus Torvalds authored
      Pull i2c updates from Wolfram Sang:
       "Most notable:
      
         - introducing the i2c_quirk infrastructure.  Now, flaws of I2C
           controllers can be described and the core will check if the flaws
           collide with the messages to be sent
      
         - wait_for_completion return type cleanup series
      
         - new drivers for Digicolor, Netlogic XLP, Ingenic JZ4780
      
         - updates to the I2C slave framework which include API changes.  Its
           only user was updated, too.  Documentation was finally added
      
         - changed dynamic bus numbering for the DT case.  This could change
           bus numbers for users.  However, it fixes a collision where dynamic
           and static busses request the same id.
      
         - driver bugfixes, cleanups"
      
      * 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (52 commits)
        i2c: xlp9xx: Driver for Netlogic XLP9XX/5XX I2C controller
        of: Add vendor prefix 'netlogic'
        i2c: davinci: use ICPFUNC to toggle I2C as gpio for bus recovery
        i2c: davinci: use bus recovery infrastructure
        i2c: change input parameter to i2c_adapter for prepare/unprepare_recovery
        i2c: i2c-mux-gpio: remove error messages for probe deferrals
        i2c: jz4780: Add i2c bus controller driver for Ingenic JZ4780
        i2c: dln2: set the device tree node of the adapter
        i2c: davinci: fixup wait_for_completion_timeout handling
        i2c: mpc: Fix ISR return value
        i2c: slave-eeprom: add more info when to increase the pointer
        i2c: slave: add documentation for i2c-slave-eeprom
        Documentation: i2c: describe the new slave mode
        i2c: slave: rework the slave API
        i2c: add support for the Digicolor I2C controller
        i2c: busses with dynamic ids should start after fixed ids for DT
        of: base: add function to get highest id of an alias stem
        i2c: designware: Suppress error message if platform_get_irq() < 0
        i2c: mpc: assign the correct prescaler from SVR
        i2c: img-scb: fixup of wait_for_completion_timeout return handling
        ...
      c3a416a6
    • Linus Torvalds's avatar
      Merge tag 'vfio-v4.1-rc1' of git://github.com/awilliam/linux-vfio · 8c194f3b
      Linus Torvalds authored
      Pull VFIO updates from Alex Williamson:
      
       - VFIO platform bus driver support (Baptiste Reynal, Antonios Motakis,
         testing and review by Eric Auger)
      
       - Split VFIO irqfd support to separate module (Alex Williamson)
      
       - vfio-pci VGA arbiter client (Alex Williamson)
      
       - New vfio-pci.ids= module option (Alex Williamson)
      
       - vfio-pci D3 power state support for idle devices (Alex Williamson)
      
      * tag 'vfio-v4.1-rc1' of git://github.com/awilliam/linux-vfio: (30 commits)
        vfio-pci: Fix use after free
        vfio-pci: Move idle devices to D3hot power state
        vfio-pci: Remove warning if try-reset fails
        vfio-pci: Allow PCI IDs to be specified as module options
        vfio-pci: Add VGA arbiter client
        vfio-pci: Add module option to disable VGA region access
        vgaarb: Stub vga_set_legacy_decoding()
        vfio: Split virqfd into a separate module for vfio bus drivers
        vfio: virqfd_lock can be static
        vfio: put off the allocation of "minor" in vfio_create_group
        vfio/platform: implement IRQ masking/unmasking via an eventfd
        vfio: initialize the virqfd workqueue in VFIO generic code
        vfio: move eventfd support code for VFIO_PCI to a separate file
        vfio: pass an opaque pointer on virqfd initialization
        vfio: add local lock for virqfd instead of depending on VFIO PCI
        vfio: virqfd: rename vfio_pci_virqfd_init and vfio_pci_virqfd_exit
        vfio: add a vfio_ prefix to virqfd_enable and virqfd_disable and export
        vfio/platform: support for level sensitive interrupts
        vfio/platform: trigger an interrupt via eventfd
        vfio/platform: initial interrupts support code
        ...
      8c194f3b
    • Linus Torvalds's avatar
      Merge tag 'pinctrl-v4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl · 07e492eb
      Linus Torvalds authored
      Pull pincontrol updates from Linus Walleij:
       "This is the bulk of pin control changes for the v4.1 development
        cycle.  Nothing really exciting this time: we basically added a few
        new drivers and subdrivers and stabilized them in linux-next.  Some
        cleanups too.  With sunrisepoint Intel has a real fine fully featured
        pin control driver for contemporary hardware, and the AMD driver is
        also for large deployments.  Most of the others are ARM devices.
      
        New drivers:
          - Intel Sunrisepoint
          - AMD KERNCZ GPIO
          - Broadcom Cygnus IOMUX
      
        New subdrivers:
          - Marvell MVEBU Armada 39x SoCs
          - Samsung Exynos 5433
          - nVidia Tegra 210
          - Mediatek MT8135
          - Mediatek MT8173
          - AMLogic Meson8b
          - Qualcomm PM8916
      
        On top of this cleanups and development history for the above drivers
        as issues were fixed after merging"
      
      * tag 'pinctrl-v4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (71 commits)
        pinctrl: sirf: move sgpio lock into state container
        pinctrl: Add support for PM8916 GPIO's and MPP's
        pinctrl: bcm2835: Fix support for threaded level triggered IRQs
        sh-pfc: r8a7790: add EtherAVB pin groups
        pinctrl: Document "function" + "pins" pinmux binding
        pinctrl: intel: Add Intel Sunrisepoint pin controller and GPIO support
        pinctrl: fsl: imx: Check for 0 config register
        pinctrl: Add support for Meson8b
        documentation: Extend pinctrl docs for Meson8b
        pinctrl: Cleanup Meson8 driver
        Fix inconsistent spinlock of AMD GPIO driver which can be recognized by static analysis tool smatch. Declare constant Variables with Sparse's suggestion.
        pinctrl: at91: convert __raw to endian agnostic IO
        pinctrl: constify of_device_id array
        pinctrl: pinconf-generic: add dt node names to error messages
        pinctrl: pinconf-generic: scan also referenced phandle node
        pinctrl: mvebu: add suspend/resume support to Armada XP pinctrl driver
        pinctrl: st: Display pin's function when printing pinctrl debug information
        pinctrl: st: Show correct pin direction also in GPIO mode
        pinctrl: st: Supply a GPIO get_direction() call-back
        pinctrl: st: Move st_get_pio_control() further up the source file
        ...
      07e492eb
    • Linus Torvalds's avatar
      Merge tag 'backlight-for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight · b240452a
      Linus Torvalds authored
      Pull backlight updates from Lee Jones:
       "Changes to existing drivers:
      
         - Use of_get_child_by_name() instead of refcount; 88pm860x_bl
      
         - Terminate array with NULL element; da9052_bl"
      
      * tag 'backlight-for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
        backlight: da9052_bl: Terminate da9052_wled_ids array with empty element
        backlight: 88pm860x_bl: Use of_get_child_by_name() instead of refcount hack
      b240452a
    • Linus Torvalds's avatar
      Merge tag 'mfd-for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd · f0c1bc95
      Linus Torvalds authored
      Pull MFD updates from Lee Jones:
       "Changes to existing drivers:
      
         - Rename child driver [axp288_battery => axp288_fuel_gauge]; axp20x
         - Rename child driver [max77693-flash => max77693-led]; max77693
         - Error handling fixes; intel_soc_pmic
         - GPIO tweaking; intel_soc_pmic
         - Remove non-DT code; vexpress-sysreg, tc3589x
         - Remove unused/legacy code; ti_am335x_tscadc, rts5249, rtsx_gops, rtsx_pcr,
                                      rtc-s5m, sec-core, max77693, menelaus,
                                      wm5102-tables
         - Trivial fixups; rtsx_pci, da9150-core, sec-core, max7769, max77693,
                           mc13xxx-core, dln2, hi6421-pmic-core, rk808, twl4030-power,
                           lpc_ich, menelaus, twl6040
         - Update register/address values; rts5227, rts5249
         - DT and/or binding document fixups; arizona, da9150, mt6397, axp20x,
                                              qcom-rpm, qcom-spmi-pmic
         - Couple of trivial core Kconfig fixups
         - Remove use of seq_printf return value; ab8500-debugfs
         - Remove __exit markups; menelaus, tps65010
         - Fix platform-device name collisions; mfd-core
      
        New drivers/supported devices:
      
         - Add support for wm8280/wm8281 into arizona
         - Add support for COMe-cBL6 into kempld-core
         - Add support for rts524a and rts525a into rts5249
         - Add support for ipq8064 into qcom_rpm
         - Add support for extcon into axp20x
         - New MediaTek MT6397 PMIC driver
         - New Maxim MAX77843 PMIC dirver
         - New Intel Quark X1000 I2C-GPIO driver
         - New Skyworks SKY81452 driver"
      
      * tag 'mfd-for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (76 commits)
        mfd: sec: Fix RTC alarm interrupt number on S2MPS11
        mfd: wm5102: Remove registers for output 3R from readable list
        mfd: tps65010: Remove incorrect __exit markups
        mfd: devicetree: bindings: Add Qualcomm RPM regulator subnodes
        mfd: axp20x: Add support for extcon cell
        mfd: lpc_ich: Sort IDs
        mfd: twl6040: Remove wrong and unneeded "platform:twl6040" modalias
        mfd: qcom-spmi-pmic: Add specific compatible strings for Qualcomm's SPMI PMIC's
        mfd: axp20x: Fix duplicate const for model names
        mfd: menelaus: Use macro for magic number
        mfd: menelaus: Drop support for SW controller VCORE
        mfd: menelaus: Delete omap_has_menelaus
        mfd: arizona: Correct type of gpio_defaults
        mfd: lpc_ich: Sort IDs
        mfd: Fix a typo in Kconfig
        mfd: qcom_rpm: Add support for IPQ8064
        mfd: devicetree: qcom_rpm: Document IPQ8064 resources
        mfd: core: Fix platform-device name collisions
        mfd: intel_quark_i2c_gpio: Don't crash if !DMI
        dt-bindings: Add vendor-prefix for X-Powers
        ...
      f0c1bc95
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 1dcf58d6
      Linus Torvalds authored
      Merge first patchbomb from Andrew Morton:
      
       - arch/sh updates
      
       - ocfs2 updates
      
       - kernel/watchdog feature
      
       - about half of mm/
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (122 commits)
        Documentation: update arch list in the 'memtest' entry
        Kconfig: memtest: update number of test patterns up to 17
        arm: add support for memtest
        arm64: add support for memtest
        memtest: use phys_addr_t for physical addresses
        mm: move memtest under mm
        mm, hugetlb: abort __get_user_pages if current has been oom killed
        mm, mempool: do not allow atomic resizing
        memcg: print cgroup information when system panics due to panic_on_oom
        mm: numa: remove migrate_ratelimited
        mm: fold arch_randomize_brk into ARCH_HAS_ELF_RANDOMIZE
        mm: split ET_DYN ASLR from mmap ASLR
        s390: redefine randomize_et_dyn for ELF_ET_DYN_BASE
        mm: expose arch_mmap_rnd when available
        s390: standardize mmap_rnd() usage
        powerpc: standardize mmap_rnd() usage
        mips: extract logic for mmap_rnd()
        arm64: standardize mmap_rnd() usage
        x86: standardize mmap_rnd() usage
        arm: factor out mmap ASLR into mmap_rnd
        ...
      1dcf58d6
    • Vladimir Murzin's avatar
      Documentation: update arch list in the 'memtest' entry · e4b0db72
      Vladimir Murzin authored
      Since arm64/arm support memtest command line option update the "memtest"
      entry.
      Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Will Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e4b0db72
    • Vladimir Murzin's avatar
      Kconfig: memtest: update number of test patterns up to 17 · 8d8cfb47
      Vladimir Murzin authored
      Additional test patterns for memtest were introduced since commit
      63823126 ("x86: memtest: add additional (regular) test patterns"),
      but looks like Kconfig was not updated that time.
      
      Update Kconfig entry with the actual number of maximum test patterns.
      Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Will Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d8cfb47
    • Vladimir Murzin's avatar
      arm: add support for memtest · d30eae47
      Vladimir Murzin authored
      Add support for memtest command line option.
      Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
      Acked-by: default avatarWill Deacon <will.deacon@arm.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d30eae47
    • Vladimir Murzin's avatar
      arm64: add support for memtest · 36dd9086
      Vladimir Murzin authored
      Add support for memtest command line option.
      Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
      Acked-by: default avatarWill Deacon <will.deacon@arm.com>
      Tested-by: default avatarMark Rutland <mark.rutland@arm.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      36dd9086
    • Vladimir Murzin's avatar
      memtest: use phys_addr_t for physical addresses · 7f70baee
      Vladimir Murzin authored
      Since memtest might be used by other architectures pass input parameters
      as phys_addr_t instead of long to prevent overflow.
      Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
      Acked-by: default avatarWill Deacon <will.deacon@arm.com>
      Tested-by: default avatarMark Rutland <mark.rutland@arm.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7f70baee
    • Vladimir Murzin's avatar
      mm: move memtest under mm · 4a20799d
      Vladimir Murzin authored
      Memtest is a simple feature which fills the memory with a given set of
      patterns and validates memory contents, if bad memory regions is detected
      it reserves them via memblock API.  Since memblock API is widely used by
      other architectures this feature can be enabled outside of x86 world.
      
      This patch set promotes memtest to live under generic mm umbrella and
      enables memtest feature for arm/arm64.
      
      It was reported that this patch set was useful for tracking down an issue
      with some errant DMA on an arm64 platform.
      
      This patch (of 6):
      
      There is nothing platform dependent in the core memtest code, so other
      platforms might benefit from this feature too.
      
      [linux@roeck-us.net: MEMTEST depends on MEMBLOCK]
      Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
      Acked-by: default avatarWill Deacon <will.deacon@arm.com>
      Tested-by: default avatarMark Rutland <mark.rutland@arm.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Paul Bolle <pebolle@tiscali.nl>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4a20799d