1. 04 Jan, 2006 1 commit
  2. 16 Dec, 2005 5 commits
  3. 15 Dec, 2005 1 commit
  4. 14 Dec, 2005 1 commit
  5. 12 Dec, 2005 2 commits
  6. 06 Dec, 2005 4 commits
    • Jack Steiner's avatar
      [IA64-SGI] Fix SN PTC deadlock recovery · 590711b7
      Jack Steiner authored
      
      
      The patch that added support for a new platform chipset (shub2) broke
      PTC deadlock recovery on older versions of the chipset. (PTCs are the
      SN platform-specific method for doing a global TLB purge). This
      patch fixes deadlock recovery so that it works on both the old & new
      chipsets.
      Signed-off-by: default avatarJack Steiner <steiner@sgi.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      590711b7
    • Robin Holt's avatar
      [IA64] Change SET_PERSONALITY to comply with comment in binfmt_elf.c. · bd1d6e24
      Robin Holt authored
      
      
      We have a customer application which trips a bug.  The problem arises
      when a driver attempts to call do_munmap on an area which is mapped, but
      because current->thread.task_size has been set to 0xC0000000, the call
      to do_munmap fails thinking it is an unmap beyond the user's address
      space.
      
      The comment in fs/binfmt_elf.c in load_elf_library() before the call
      to SET_PERSONALITY() indicates that task_size must not be changed for
      the running application until flush_thread, but is for ia64 executing
      ia32 binaries.
      
      This patch moves the setting of task_size from SET_PERSONALITY() to
      flush_thread() as indicated.  The customer application no longer is able
      to trip the bug.
      Signed-off-by: default avatarRobin Holt <holt@sgi.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      bd1d6e24
    • Jack Steiner's avatar
      [IA64] Limit the maximum NODEDATA_ALIGN() offset · acb7f672
      Jack Steiner authored
      
      
      The per-node data structures are allocated with strided offsets that are a
      function of the node number. This prevents excessive cache-aliasing from
      occurring.
      
      On systems with a large number of nodes, the strided offset becomes
      too large. This patch restricts the maximum offset to 32MB. This is far larger
      than the size of any current L3 cache.
      Signed-off-by: default avatarJack Steiner <steiner@sgi.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      acb7f672
    • John Keller's avatar
      [IA64-SGI] altix: pci_window fixup · 3ec829b6
      John Keller authored
      
      
      Altix only patch to add fixup code that sets up
      pci_controller->window. This code is a temporary
      fix until ACPI support on Altix is added.
      
      Also, corrects the usage of pci_dev->sysdata,
      which had previously been used to reference
      platform specific device info, to now point to
      a pci_controller struct.
      Signed-off-by: default avatarJohn Keller <jpk@sgi.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      3ec829b6
  7. 05 Dec, 2005 1 commit
  8. 02 Dec, 2005 2 commits
  9. 29 Nov, 2005 2 commits
  10. 23 Nov, 2005 1 commit
    • Jim Keniston's avatar
      [PATCH] kprobes: Fix return probes on sys_execve · 8bf1101b
      Jim Keniston authored
      
      
      Fix a bug in kprobes that can cause an Oops or even a crash when a return
      probe is installed on one of the following functions: sys_execve,
      do_execve, load_*_binary, flush_old_exec, or flush_thread.  The fix is to
      remove the call to kprobe_flush_task() in flush_thread().  This fix has
      been tested on all architectures for which the return-probes feature has
      been implemented (i386, x86_64, ppc64, ia64).  Please apply.
      
      BACKGROUND
      
      Up to now, we have called kprobe_flush_task() under two situations: when a
      task exits, and when it execs.  Flushing kretprobe_instances on exit is
      correct because (a) do_exit() doesn't return, and (b) one or more
      return-probed functions may be active when a task calls do_exit().  Neither
      is the case for sys_execve() and its callees.
      
      Initially, the mistaken call to kprobe_flush_task() on exec was harmless
      because we put the "real" return address of each active probed function
      back in the stack, just to be safe, when we recycled its
      kretprobe_instance.  When support for ppc64 and ia64 was added, this safety
      measure couldn't be employed, and was eventually dropped even for i386 and
      x86_64.  sys_execve() and its callees were informally blacklisted for
      return probes until this fix was developed.
      Acked-by: default avatarPrasanna S Panchamukhi <prasanna@in.ibm.com>
      Signed-off-by: default avatarJim Keniston <jkenisto@us.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      8bf1101b
  11. 21 Nov, 2005 3 commits
  12. 17 Nov, 2005 2 commits
    • Chen, Kenneth W's avatar
      [IA64] polish comments for tlb fault handler in ivt.S · e8aabc47
      Chen, Kenneth W authored
      
      
      Polish the comments specifically in vhpt_miss and nested_dtlb_miss
      handlers.  I think it's better to explicitly name each page table
      level with its name instead of numerically name them.  i.e., use
      pgd, pud, pmd, and pte instead of referring as L1, L2, L3 etc.
      Along the line, remove some magic number in the comments like:
      "PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)".  No code change at
      all, pure comment update.  Feel free to shoot anything you have,
      darts or tomahawk cruise missile.  I will duck behind a bunker ;-)
      Signed-off-by: default avatarKen Chen <kenneth.w.chen@intel.com>
      Acked-by: default avatarRobin Holt <holt@sgi.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      e8aabc47
    • Chen, Kenneth W's avatar
      [IA64] 4 level page table bug fix in vhpt_miss · fedb25fa
      Chen, Kenneth W authored
      
      
      From source code inspection, I think there is a bug with 4 level
      page table with vhpt_miss handler.  In the code path of rechecking
      page table entry against previously read value after tlb insertion,
      *pte value in register r18 was overwritten with value newly read
      from pud pointer, render the check of new *pte against previous
      *pte completely wrong.  Though the bug is none fatal and the penalty
      is to purge the entry and retry.  For functional correctness, it
      should be fixed.  The fix is to use a different register so new
      *pud don't trash *pte.  (btw, the comments in the cmp statement is
      wrong as well, which I will address in the next patch).
      Signed-off-by: default avatarKen Chen <kenneth.w.chen@intel.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      fedb25fa
  13. 15 Nov, 2005 1 commit
    • Chen, Kenneth W's avatar
      [PATCH] ia64: cpu_idle performance bug fix · 1e185b97
      Chen, Kenneth W authored
      Our performance validation on 2.6.15-rc1 caught a disastrous performance
      regression on ia64 with netperf (-98%) and volanomark (-58%) compares to
      previous kernel version 2.6.14-git7.  See the following chart (result
      group 1 & 2).
      
        http://kernel-perf.sourceforge.net/results.machine_id=26.html
      
      We have root caused it to commit 64c7c8f8
      
      
      
      This changeset broke the ia64 task resched notification.  In
      sched.c:resched_task(), a reschedule IPI is conditioned upon
      TIF_POLLING_NRFLAG.  However, the above changeset unconditionally set
      the polling thread flag for idle tasks regardless whether pal_halt_light
      is in use or not.  As a result, resched IPI is not sent from
      resched_task().  And since the default behavior on ia64 is to use
      pal_halt_light, we end up delaying the rescheduling task until next
      timer tick, and thus cause the performance regression.
      
      This fixes the performance bug.  I'm glad our performance suite is
      turning up bad performance bug like this in time.
      Signed-off-by: default avatarKen Chen <kenneth.w.chen@intel.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      1e185b97
  14. 14 Nov, 2005 1 commit
  15. 11 Nov, 2005 2 commits
    • Mark Maule's avatar
      [IA64-SGI] set altix preferred console · ff51224c
      Mark Maule authored
      
      
      Fix default VGA console on SN platforms.  Since SN firmware does not pass
      enough ACPI information to identify VGA cards and the associated legacy IO/MEM
      addresses, we rely on the EFI PCDP table.  Since the linux pcdp driver is
      optional (and overridden if console= directives are used) SN duplicates a
      portion of the pcdp scan code to identify if there is a usable console VGA
      adapter.  Additionally, dup necessary pcdp related structs to avoid dragging
      drivers/pcdp.h into a more public location.
      Signed-off-by: default avatarMark Maule <maule@sgi.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      ff51224c
    • Robin Holt's avatar
      [IA64] 4-level page tables · 837cd0bd
      Robin Holt authored
      
      
      This patch introduces 4-level page tables to ia64.  I have run
      some benchmarks and found nothing interesting.  Performance has
      consistently fallen within the noise range.
      
      It also introduces a config option (setting the default to 3
      levels).  The config option prevents having 4 level page
      tables with 64k base page size.
      Signed-off-by: default avatarRobin Holt <holt@sgi.com>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      837cd0bd
  16. 10 Nov, 2005 2 commits
  17. 09 Nov, 2005 3 commits
    • Nick Piggin's avatar
      [PATCH] sched: resched and cpu_idle rework · 64c7c8f8
      Nick Piggin authored
      
      
      Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce
      confusion, and make their semantics rigid.  Improves efficiency of
      resched_task and some cpu_idle routines.
      
      * In resched_task:
      - TIF_NEED_RESCHED is only cleared with the task's runqueue lock held,
        and as we hold it during resched_task, then there is no need for an
        atomic test and set there. The only other time this should be set is
        when the task's quantum expires, in the timer interrupt - this is
        protected against because the rq lock is irq-safe.
      
      - If TIF_NEED_RESCHED is set, then we don't need to do anything. It
        won't get unset until the task get's schedule()d off.
      
      - If we are running on the same CPU as the task we resched, then set
        TIF_NEED_RESCHED and no further action is required.
      
      - If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set
        after TIF_NEED_RESCHED has been set, then we need to send an IPI.
      
      Using these rules, we are able to remove the test and set operation in
      resched_task, and make clear the previously vague semantics of
      POLLING_NRFLAG.
      
      * In idle routines:
      - Enter cpu_idle with preempt disabled. When the need_resched() condition
        becomes true, explicitly call schedule(). This makes things a bit clearer
        (IMO), but haven't updated all architectures yet.
      
      - Many do a test and clear of TIF_NEED_RESCHED for some reason. According
        to the resched_task rules, this isn't needed (and actually breaks the
        assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock
        held). So remove that. Generally one less locked memory op when switching
        to the idle thread.
      
      - Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner
        most polling idle loops. The above resched_task semantics allow it to be
        set until before the last time need_resched() is checked before going into
        a halt requiring interrupt wakeup.
      
        Many idle routines simply never enter such a halt, and so POLLING_NRFLAG
        can be always left set, completely eliminating resched IPIs when rescheduling
        the idle task.
      
        POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs.
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Con Kolivas <kernel@kolivas.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      64c7c8f8
    • Nick Piggin's avatar
      [PATCH] sched: disable preempt in idle tasks · 5bfb5d69
      Nick Piggin authored
      
      
      Run idle threads with preempt disabled.
      
      Also corrected a bugs in arm26's cpu_idle (make it actually call schedule()).
      How did it ever work before?
      
      Might fix the CPU hotplugging hang which Nigel Cunningham noted.
      
      We think the bug hits if the idle thread is preempted after checking
      need_resched() and before going to sleep, then the CPU offlined.
      
      After calling stop_machine_run, the CPU eventually returns from preemption and
      into the idle thread and goes to sleep.  The CPU will continue executing
      previous idle and have no chance to call play_dead.
      
      By disabling preemption until we are ready to explicitly schedule, this bug is
      fixed and the idle threads generally become more robust.
      
      From: alexs <ashepard@u.washington.edu>
      
        PPC build fix
      
      From: Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
      
        MIPS build fix
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Signed-off-by: default avatarYoichi Yuasa <yuasa@hh.iij4u.or.jp>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      5bfb5d69
    • Christoph Hellwig's avatar
      [PATCH] remove ioctl32_handler_t · 7e4c54a2
      Christoph Hellwig authored
      
      
      Some architectures define and use this type in their compat_ioctl code, but
      all of them can easily use the identical ioctl_trans_handler_t type that is
      defined in common code.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Cc: Andi Kleen <ak@muc.de>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      7e4c54a2
  18. 08 Nov, 2005 6 commits