1. 04 May, 2013 2 commits
  2. 30 Apr, 2013 5 commits
    • zhangwei(Jovi)'s avatar
      sparc/sysrq: fix inconstistent help message of sysrq key · 5452c7f8
      zhangwei(Jovi) authored
      
      
      Currently help message of /proc/sysrq-trigger highlight its
      upper-case characters, like below:
      
            SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E)
            memory-full-oom-kill(F) kill-all-tasks(I) ...
      
      this would confuse user trigger sysrq by upper-case character, which is
      inconsistent with the real lower-case character registed key.
      
      This inconsistent help message will also lead more confused when
      26 upper-case letters put into use in future.
      
      This patch fix spare sysrq key: "global-regs(y)"
      Signed-off-by: default avatarzhangwei(Jovi) <jovi.zhangwei@huawei.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5452c7f8
    • Stephen Boyd's avatar
      Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS · 446f24d1
      Stephen Boyd authored
      
      
      The help text for this config is duplicated across the x86, parisc, and
      s390 Kconfig.debug files.  Arnd Bergman noted that the help text was
      slightly misleading and should be fixed to state that enabling this
      option isn't a problem when using pre 4.4 gcc.
      
      To simplify the rewording, consolidate the text into lib/Kconfig.debug
      and modify it there to be more explicit about when you should say N to
      this config.
      
      Also, make the text a bit more generic by stating that this option
      enables compile time checks so we can cover architectures which emit
      warnings vs.  ones which emit errors.  The details of how an
      architecture decided to implement the checks isn't as important as the
      concept of compile time checking of copy_from_user() calls.
      
      While we're doing this, remove all the copy_from_user_overflow() code
      that's duplicated many times and place it into lib/ so that any
      architecture supporting this option can get the function for free.
      Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
      Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarH. Peter Anvin <hpa@zytor.com>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Acked-by: default avatarHelge Deller <deller@gmx.de>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Stephen Rothwell <sfr@canb.auug.org.au>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      446f24d1
    • Tejun Heo's avatar
      dump_stack: unify debug information printed by show_regs() · a43cb95d
      Tejun Heo authored
      
      
      show_regs() is inherently arch-dependent but it does make sense to print
      generic debug information and some archs already do albeit in slightly
      different forms.  This patch introduces a generic function to print debug
      information from show_regs() so that different archs print out the same
      information and it's much easier to modify what's printed.
      
      show_regs_print_info() prints out the same debug info as dump_stack()
      does plus task and thread_info pointers.
      
      * Archs which didn't print debug info now do.
      
        alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r,
        metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc,
        um, xtensa
      
      * Already prints debug info.  Replaced with show_regs_print_info().
        The printed information is superset of what used to be there.
      
        arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86
      
      * s390 is special in that it used to print arch-specific information
        along with generic debug info.  Heiko and Martin think that the
        arch-specific extra isn't worth keeping s390 specfic implementation.
        Converted to use the generic version.
      
      Note that now all archs print the debug info before actual register
      dumps.
      
      An example BUG() dump follows.
      
       kernel BUG at /work/os/work/kernel/workqueue.c:4841!
       invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
       Modules linked in:
       CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7
       Hardware name: empty empty/S3992, BIOS 080011  10/26/2007
       task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000
       RIP: 0010:[<ffffffff8234a07e>]  [<ffffffff8234a07e>] init_workqueues+0x4/0x6
       RSP: 0000:ffff88007c861ec8  EFLAGS: 00010246
       RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001
       RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a
       RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000
       R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a
       R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
       FS:  0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000
       CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
       CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0
       DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
       DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
       Stack:
        ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650
        0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d
        ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760
       Call Trace:
        [<ffffffff81000312>] do_one_initcall+0x122/0x170
        [<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8
        [<ffffffff81c47760>] ? rest_init+0x140/0x140
        [<ffffffff81c4776e>] kernel_init+0xe/0xf0
        [<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0
        [<ffffffff81c47760>] ? rest_init+0x140/0x140
        ...
      
      v2: Typo fix in x86-32.
      
      v3: CPU number dropped from show_regs_print_info() as
          dump_stack_print_info() has been updated to print it.  s390
          specific implementation dropped as requested by s390 maintainers.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarJesper Nilsson <jesper.nilsson@axis.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Bjorn Helgaas <bhelgaas@google.com>
      Cc: Fengguang Wu <fengguang.wu@intel.com>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Vineet Gupta <vgupta@synopsys.com>
      Cc: Sam Ravnborg <sam@ravnborg.org>
      Acked-by: Chris Metcalf <cmetcalf@tilera.com>		[tile bits]
      Acked-by: Richard Kuo <rkuo@codeaurora.org>		[hexagon bits]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a43cb95d
    • Tejun Heo's avatar
      dump_stack: consolidate dump_stack() implementations and unify their behaviors · 196779b9
      Tejun Heo authored
      
      
      Both dump_stack() and show_stack() are currently implemented by each
      architecture.  show_stack(NULL, NULL) dumps the backtrace for the
      current task as does dump_stack().  On some archs, dump_stack() prints
      extra information - pid, utsname and so on - in addition to the
      backtrace while the two are identical on other archs.
      
      The usages in arch-independent code of the two functions indicate
      show_stack(NULL, NULL) should print out bare backtrace while
      dump_stack() is used for debugging purposes when something went wrong,
      so it does make sense to print additional information on the task which
      triggered dump_stack().
      
      There's no reason to require archs to implement two separate but mostly
      identical functions.  It leads to unnecessary subtle information.
      
      This patch expands the dummy fallback dump_stack() implementation in
      lib/dump_stack.c such that it prints out debug information (taken from
      x86) and invokes show_stack(NULL, NULL) and drops arch-specific
      dump_stack() implementations in all archs except blackfin.  Blackfin's
      dump_stack() does something wonky that I don't understand.
      
      Debug information can be printed separately by calling
      dump_stack_print_info() so that arch-specific dump_stack()
      implementation can still emit the same debug information.  This is used
      in blackfin.
      
      This patch brings the following behavior changes.
      
      * On some archs, an extra level in backtrace for show_stack() could be
        printed.  This is because the top frame was determined in
        dump_stack() on those archs while generic dump_stack() can't do that
        reliably.  It can be compensated by inlining dump_stack() but not
        sure whether that'd be necessary.
      
      * Most archs didn't use to print debug info on dump_stack().  They do
        now.
      
      An example WARN dump follows.
      
       WARNING: at kernel/workqueue.c:4841 init_workqueues+0x35/0x505()
       Hardware name: empty
       Modules linked in:
       CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #9
        0000000000000009 ffff88007c861e08 ffffffff81c614dc ffff88007c861e48
        ffffffff8108f50f ffffffff82228240 0000000000000040 ffffffff8234a03c
        0000000000000000 0000000000000000 0000000000000000 ffff88007c861e58
       Call Trace:
        [<ffffffff81c614dc>] dump_stack+0x19/0x1b
        [<ffffffff8108f50f>] warn_slowpath_common+0x7f/0xc0
        [<ffffffff8108f56a>] warn_slowpath_null+0x1a/0x20
        [<ffffffff8234a071>] init_workqueues+0x35/0x505
        ...
      
      v2: CPU number added to the generic debug info as requested by s390
          folks and dropped the s390 specific dump_stack().  This loses %ksp
          from the debug message which the maintainers think isn't important
          enough to keep the s390-specific dump_stack() implementation.
      
          dump_stack_print_info() is moved to kernel/printk.c from
          lib/dump_stack.c.  Because linkage is per objecct file,
          dump_stack_print_info() living in the same lib file as generic
          dump_stack() means that archs which implement custom dump_stack()
          - at this point, only blackfin - can't use dump_stack_print_info()
          as that will bring in the generic version of dump_stack() too.  v1
          The v1 patch broke build on blackfin due to this issue.  The build
          breakage was reported by Fengguang Wu.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarVineet Gupta <vgupta@synopsys.com>
      Acked-by: default avatarJesper Nilsson <jesper.nilsson@axis.com>
      Acked-by: default avatarVineet Gupta <vgupta@synopsys.com>
      Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>	[s390 bits]
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Fengguang Wu <fengguang.wu@intel.com>
      Cc: Bjorn Helgaas <bhelgaas@google.com>
      Cc: Sam Ravnborg <sam@ravnborg.org>
      Acked-by: Richard Kuo <rkuo@codeaurora.org>		[hexagon bits]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      196779b9
    • Tejun Heo's avatar
      sparc32: make show_stack() acquire %fp if @_ksp is not specified · 89e3f23d
      Tejun Heo authored
      
      
      show_stack(current or NULL, NULL) is used by arch-independent code to dump
      backtrace of the current task; however, sparc32 show_stack() doesn't
      implement it and wouldn't print any backtrace when NULL @_ksp is specfied.
      
      Make show_stack() acquire and use %fp if @tsk is NULL or current and @_ksp
      is NULL.  This makes %fp fetching in dump_stack() unnecessary.  Make it
      use NULL for @_ksp instead.
      
      Only compile tested.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Cc: Bjorn Helgaas <bhelgaas@google.com>
      Cc: Fengguang Wu <fengguang.wu@intel.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Jesper Nilsson <jesper.nilsson@axis.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Vineet Gupta <vgupta@synopsys.com>
      Cc: Sam Ravnborg <sam@ravnborg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      89e3f23d
  3. 29 Apr, 2013 4 commits
    • Johannes Weiner's avatar
      sparse-vmemmap: specify vmemmap population range in bytes · 0aad818b
      Johannes Weiner authored
      
      
      The sparse code, when asking the architecture to populate the vmemmap,
      specifies the section range as a starting page and a number of pages.
      
      This is an awkward interface, because none of the arch-specific code
      actually thinks of the range in terms of 'struct page' units and always
      translates it to bytes first.
      
      In addition, later patches mix huge page and regular page backing for
      the vmemmap.  For this, they need to call vmemmap_populate_basepages()
      on sub-section ranges with PAGE_SIZE and PMD_SIZE in mind.  But these
      are not necessarily multiples of the 'struct page' size and so this unit
      is too coarse.
      
      Just translate the section range into bytes once in the generic sparse
      code, then pass byte ranges down the stack.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Cc: Ben Hutchings <ben@decadent.org.uk>
      Cc: Bernhard Schmidt <Bernhard.Schmidt@lrz.de>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Tested-by: default avatarDavid S. Miller <davem@davemloft.net>
      Cc: Wu Fengguang <fengguang.wu@intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0aad818b
    • Gerald Schaefer's avatar
      mm/hugetlb: add more arch-defined huge_pte functions · 106c992a
      Gerald Schaefer authored
      Commit abf09bed
      
       ("s390/mm: implement software dirty bits")
      introduced another difference in the pte layout vs.  the pmd layout on
      s390, thoroughly breaking the s390 support for hugetlbfs.  This requires
      replacing some more pte_xxx functions in mm/hugetlbfs.c with a
      huge_pte_xxx version.
      
      This patch introduces those huge_pte_xxx functions and their generic
      implementation in asm-generic/hugetlb.h, which will now be included on
      all architectures supporting hugetlbfs apart from s390.  This change
      will be a no-op for those architectures.
      
      [akpm@linux-foundation.org: fix warning]
      Signed-off-by: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Hillf Danton <dhillf@gmail.com>
      Acked-by: Michal Hocko <mhocko@suse.cz>	[for !s390 parts]
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Metcalf <cmetcalf@tilera.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      106c992a
    • Jiang Liu's avatar
      mm/SPARC: use free_highmem_page() to free highmem pages into buddy system · 32e1a109
      Jiang Liu authored
      
      
      Use helper function free_highmem_page() to free highmem pages into
      the buddy system.
      Signed-off-by: default avatarJiang Liu <jiang.liu@huawei.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Acked-by: default avatarSam Ravnborg <sam@ravnborg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      32e1a109
    • David Howells's avatar
      Include missing linux/slab.h inclusions · 0d01ff25
      David Howells authored
      
      
      Include missing linux/slab.h inclusions where the source file is currently
      expecting to get kmalloc() and co. through linux/proc_fs.h.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      cc: linux-s390@vger.kernel.org
      cc: sparclinux@vger.kernel.org
      cc: linux-efi@vger.kernel.org
      cc: linux-mtd@lists.infradead.org
      cc: devel@driverdev.osuosl.org
      cc: x86@kernel.org
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      0d01ff25
  4. 24 Apr, 2013 1 commit
  5. 19 Apr, 2013 1 commit
    • David S. Miller's avatar
      sparc64: Fix race in TLB batch processing. · f36391d2
      David S. Miller authored
      
      
      As reported by Dave Kleikamp, when we emit cross calls to do batched
      TLB flush processing we have a race because we do not synchronize on
      the sibling cpus completing the cross call.
      
      So meanwhile the TLB batch can be reset (tb->tlb_nr set to zero, etc.)
      and either flushes are missed or flushes will flush the wrong
      addresses.
      
      Fix this by using generic infrastructure to synchonize on the
      completion of the cross call.
      
      This first required getting the flush_tlb_pending() call out from
      switch_to() which operates with locks held and interrupts disabled.
      The problem is that smp_call_function_many() cannot be invoked with
      IRQs disabled and this is explicitly checked for with WARN_ON_ONCE().
      
      We get the batch processing outside of locked IRQ disabled sections by
      using some ideas from the powerpc port. Namely, we only batch inside
      of arch_{enter,leave}_lazy_mmu_mode() calls.  If we're not in such a
      region, we flush TLBs synchronously.
      
      1) Get rid of xcall_flush_tlb_pending and per-cpu type
         implementations.
      
      2) Do TLB batch cross calls instead via:
      
      	smp_call_function_many()
      		tlb_pending_func()
      			__flush_tlb_pending()
      
      3) Batch only in lazy mmu sequences:
      
      	a) Add 'active' member to struct tlb_batch
      	b) Define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
      	c) Set 'active' in arch_enter_lazy_mmu_mode()
      	d) Run batch and clear 'active' in arch_leave_lazy_mmu_mode()
      	e) Check 'active' in tlb_batch_add_one() and do a synchronous
                 flush if it's clear.
      
      4) Add infrastructure for synchronous TLB page flushes.
      
      	a) Implement __flush_tlb_page and per-cpu variants, patch
      	   as needed.
      	b) Likewise for xcall_flush_tlb_page.
      	c) Implement smp_flush_tlb_page() to invoke the cross-call.
      	d) Wire up global_flush_tlb_page() to the right routine based
                 upon CONFIG_SMP
      
      5) It turns out that singleton batches are very common, 2 out of every
         3 batch flushes have only a single entry in them.
      
         The batch flush waiting is very expensive, both because of the poll
         on sibling cpu completeion, as well as because passing the tlb batch
         pointer to the sibling cpus invokes a shared memory dereference.
      
         Therefore, in flush_tlb_pending(), if there is only one entry in
         the batch perform a completely asynchronous global_flush_tlb_page()
         instead.
      Reported-by: default avatarDave Kleikamp <dave.kleikamp@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarDave Kleikamp <dave.kleikamp@oracle.com>
      f36391d2
  6. 17 Apr, 2013 1 commit
  7. 13 Apr, 2013 1 commit
  8. 10 Apr, 2013 1 commit
  9. 09 Apr, 2013 2 commits
  10. 08 Apr, 2013 1 commit
  11. 02 Apr, 2013 2 commits
  12. 31 Mar, 2013 7 commits
  13. 21 Mar, 2013 1 commit
    • Daniel Borkmann's avatar
      filter: bpf_jit_comp: refactor and unify BPF JIT image dump output · 79617801
      Daniel Borkmann authored
      
      
      If bpf_jit_enable > 1, then we dump the emitted JIT compiled image
      after creation. Currently, only SPARC and PowerPC has similar output
      as in the reference implementation on x86_64. Make a small helper
      function in order to reduce duplicated code and make the dump output
      uniform across architectures x86_64, SPARC, PPC, ARM (e.g. on ARM
      flen, pass and proglen are currently not shown, but would be
      interesting to know as well), also for future BPF JIT implementations
      on other archs.
      
      Cc: Mircea Gherzan <mgherzan@gmail.com>
      Cc: Matt Evans <matt@ozlabs.org>
      Cc: Eric Dumazet <eric.dumazet@google.com>
      Cc: David S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      79617801
  14. 19 Mar, 2013 2 commits
  15. 11 Mar, 2013 1 commit
  16. 05 Mar, 2013 1 commit
  17. 04 Mar, 2013 1 commit
    • Al Viro's avatar
      make do_mremap() static · 4b377bab
      Al Viro authored
      
      
      The extern in sys_sparc_64.c was a rudiment of time when do_mremap()
      used to exist in MMU case (it doesn't anymore).  As for !MMU one,
      nothing uses it outside of mm/nommu.c...
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      4b377bab
  18. 03 Mar, 2013 6 commits