1. 05 Sep, 2009 12 commits
  2. 04 Sep, 2009 3 commits
  3. 03 Sep, 2009 2 commits
    • David S. Miller's avatar
      sparc64: Kill spurious NMI watchdog triggers by increasing limit to 30 seconds. · e6617c6e
      David S. Miller authored
      This is a compromise and a temporary workaround for bootup NMI
      watchdog triggers some people see with qla2xxx devices present.
      
      This happens when, for example:
      
      CPU 0 is in the driver init and looping submitting mailbox commands to
      load the firmware, then waiting for completion.
      
      CPU 1 is receiving the device interrupts.  CPU 1 is where the NMI
      watchdog triggers.
      
      CPU 0 is submitting mailbox commands fast enough that by the time CPU
      1 returns from the device interrupt handler, a new one is pending.
      This sequence runs for more than 5 seconds.
      
      The problematic case is CPU 1's timer interrupt running when the
      barrage of device interrupts begin.  Then we have:
      
      	timer interrupt
      	return for softirq checking
      	pending, thus enable interrupts
      
      		 qla2xxx interrupt
      		 return
      		 qla2xxx interrupt
      		 return
      		 ... 5+ seconds pass
      		 final qla2xxx interrupt for fw load
      		 return
      
      	run timer softirq
      	return
      
      At some point in the multi-second qla2xxx interrupt storm we trigger
      the NMI watchdog on CPU 1 from the NMI interrupt handler.
      
      The timer softirq, once we get back to running it, is smart enough to
      run the timer work enough times to make up for the missed timer
      interrupts.
      
      However, the NMI watchdogs (both x86 and sparc) use the timer
      interrupt count to notice the cpu is wedged.  But in the above
      scenerio we'll receive only one such timer interrupt even if we last
      all the way back to running the timer softirq.
      
      The default watchdog trigger point is only 5 seconds, which is pretty
      low (the softwatchdog triggers at 60 seconds).  So increase it to 30
      seconds for now.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e6617c6e
    • Paul Mackerras's avatar
      perf_counter/powerpc: Fix cache event codes for POWER7 · a3df6f7d
      Paul Mackerras authored
      I had the codes for L1 D-cache load accesses and misses swapped
      around, and the wrong codes for LL-cache accesses and misses.
      This corrects them.
      Reported-by: default avatarCorey Ashford <cjashfor@linux.vnet.ibm.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: <stable@kernel.org>
      LKML-Reference: <19103.8514.709300.585484@cargo.ozlabs.ibm.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a3df6f7d
  4. 01 Sep, 2009 6 commits
  5. 31 Aug, 2009 10 commits
  6. 30 Aug, 2009 3 commits
  7. 29 Aug, 2009 4 commits
    • Peter Zijlstra's avatar
      perf_counter: Fix /0 bug in swcounters · eced1dfc
      Peter Zijlstra authored
      We have a race in the swcounter stuff where we can start
      counting a counter that has never been enabled, this leads to a
      /0 situation.
      
      The below avoids the /0 but doesn't close the race, this would
      need a new counter state.
      
      The race is due to perf_swcounter_is_counting() which cannot
      discern between disabled due to scheduled out, and disabled for
      any other reason.
      
      Such a crash has been seen by Ingo:
      
      [  967.092372] divide error: 0000 [#1] SMP
      [  967.096499] last sysfs file: /sys/devices/system/cpu/cpu15/cache/index2/shared_cpu_map
      [  967.104846] CPU 5
      [  967.106965] Modules linked in:
      [  967.110169] Pid: 3351, comm: hackbench Not tainted 2.6.31-rc8-tip-01158-gd940a54-dirty #1568 X8DTN
      [  967.119456] RIP: 0010:[<ffffffff810c0aba>]  [<ffffffff810c0aba>] perf_swcounter_ctx_event+0x127/0x1af
      [  967.129137] RSP: 0018:ffff8801a95abd70  EFLAGS: 00010046
      [  967.134699] RAX: 0000000000000002 RBX: ffff8801bd645c00 RCX: 0000000000000002
      [  967.142162] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801bd645d40
      [  967.149584] RBP: ffff8801a95abdb0 R08: 0000000000000001 R09: ffff8801a95abe00
      [  967.157042] R10: 0000000000000037 R11: ffff8801aa1245f8 R12: ffff8801a95abe00
      [  967.164481] R13: ffff8801a95abe00 R14: ffff8801aa1c0e78 R15: 0000000000000001
      [  967.171953] FS:  0000000000000000(0000) GS:ffffc90000a00000(0063) knlGS:00000000f7f486c0
      [  967.180406] CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
      [  967.186374] CR2: 000000004822c0ac CR3: 00000001b19a2000 CR4: 00000000000006e0
      [  967.193770] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  967.201224] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
      [  967.208692] Process hackbench (pid: 3351, threadinfo ffff8801a95aa000, task ffff8801a96b0000)
      [  967.217607] Stack:
      [  967.219711]  0000000000000000 0000000000000037 0000000200000001 ffffc90000a1107c
      [  967.227296] <0> ffff8801a95abe00 0000000000000001 0000000000000001 0000000000000037
      [  967.235333] <0> ffff8801a95abdf0 ffffffff810c0c20 0000000200a14f30 ffff8801a95abe40
      [  967.243532] Call Trace:
      [  967.246103]  [<ffffffff810c0c20>] do_perf_swcounter_event+0xde/0xec
      [  967.252635]  [<ffffffff810c0ca7>] perf_tpcounter_event+0x79/0x7b
      [  967.258957]  [<ffffffff81037f73>] ftrace_profile_sched_switch+0xc0/0xcb
      [  967.265791]  [<ffffffff8155f22d>] schedule+0x429/0x4c4
      [  967.271156]  [<ffffffff8100c01e>] int_careful+0xd/0x14
      Reported-by: default avatarIngo Molnar <mingo@elte.hu>
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      LKML-Reference: <1251472247.17617.74.camel@laptop>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      eced1dfc
    • Linus Torvalds's avatar
      Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 · adda7661
      Linus Torvalds authored
      * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
        ACPI: don't free non-existent backlight in acpi video module
        toshiba_acpi: return on a fail path
        ACPICA: Windows compatibility fix: same buffer/string store
      adda7661
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify · 8442edc1
      Linus Torvalds authored
      * 'for-linus' of git://git.infradead.org/users/eparis/notify:
        inotify: update the group mask on mark addition
        inotify: fix length reporting and size checking
        inotify: do not send a block of zeros when no pathname is available
      8442edc1
    • Grant Grundler's avatar
      parisc: fix warning in traps.c · 825e1e23
      Grant Grundler authored
      On Tue, Aug 18, 2009 at 01:45:17PM -0400, John David Anglin wrote:
      >  CC      arch/parisc/kernel/traps.o
      > arch/parisc/kernel/traps.c: In function 'handle_interruption':
      > arch/parisc/kernel/traps.c:535:18: warning: operation on 'regs->iasq[0]'
      > may be undefined
      
      Yes - Line 535 should use both [0] and [1].
      Reported-by: default avatarJohn David Anglin <dave@hiauly1.hia.nrc.ca>
      Signed-off-by: default avatarGrant Grundler <grundler@parisc-linux.org>
      Signed-off-by: default avatarKyle McMartin <kyle@mcmartin.ca>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      825e1e23