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Steven Rostedt 3cb5f1a3e5 powerpc/ppc64/tracing: Add stack frame to calls of trace_hardirqs_on/off 
When an interrupt occurs in userspace, we can call trace_hardirqs_on/off()
    With one level stack. But if we have irqsoff tracing enabled,
    it checks both CALLER_ADDR0 and CALLER_ADDR1. The second call
    goes two stack frames up. If this is from user space, then there may
    not exist a second stack.

    Add a second stack when calling trace_hardirqs_on/off() otherwise
    the following oops might occur:

    Oops: Kernel access of bad area, sig: 11 [#1]
    PREEMPT SMP NR_CPUS=2 PA Semi PWRficient
    last sysfs file: /sys/block/sda/size
    Modules linked in: ohci_hcd ehci_hcd usbcore
    NIP: c0000000000e1c00 LR: c0000000000034d4 CTR: 000000011012c440
    REGS: c00000003e2f3af0 TRAP: 0300   Not tainted  (2.6.37-rc6+)
    MSR: 9000000000001032 <ME,IR,DR>  CR: 48044444  XER: 20000000
    DAR: 00000001ffb9db50, DSISR: 0000000040000000
    TASK = c00000003e1a00a0[2088] 'emacs' THREAD: c00000003e2f0000 CPU: 1
    GPR00: 0000000000000001 c00000003e2f3d70 c00000000084e0d0 c0000000008816e8
    GPR04: 000000001034c678 000000001032e8f9 0000000010336540 0000000040020000
    GPR08: 0000000040020000 00000001ffb9db40 c00000003e2f3e30 0000000060000000
    GPR12: 100000000000f032 c00000000fff0280 000000001032e8c9 0000000000000008
    GPR16: 00000000105be9c0 00000000105be950 00000000105be9b0 00000000105be950
    GPR20: 00000000ffb9dc50 00000000ffb9dbf0 00000000102f0000 00000000102f0000
    GPR24: 00000000102e0000 00000000102f0000 0000000010336540 c0000000009ded38
    GPR28: 00000000102e0000 c0000000000034d4 c0000000007ccb10 c00000003e2f3d70
    NIP [c0000000000e1c00] .trace_hardirqs_off+0xb0/0x1d0
    LR [c0000000000034d4] decrementer_common+0xd4/0x100
    Call Trace:
    [c00000003e2f3d70] [c00000003e2f3e30] 0xc00000003e2f3e30 (unreliable)
    [c00000003e2f3e30] [c0000000000034d4] decrementer_common+0xd4/0x100
    Instruction dump:
    81690000 7f8b0000 419e0018 f84a0028 60000000 60000000 60000000 e95f0000
    80030000 e92a0000 eb6301f8 2f800000 <eb890010> 41fe00dc a06d000a eb1e8050
    ---[ end trace 4ec7fd2be9240928 ]---

    Reported-by: Joerg Sommer <joerg@alea.gnuu.de>
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-01-21 14:08:33 +11:00
..
alpha alpha: fix WARN_ON in __local_bh_enable() 2011-01-17 05:42:16 +01:00
arm ARM: S5PV310: Add missing virtual ASoC DMA device 2011-01-18 14:47:07 +09:00
avr32 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/avr32-2.6 2011-01-13 12:06:58 -08:00
blackfin Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
cris Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
frv BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
h8300 Merge branch 'master' into for-next 2010-12-22 18:57:02 +01:00
ia64 [IA64] fix ia64 build failure in pmdp_get_and_clear 2011-01-14 10:56:38 -08:00
m32r Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 2010-10-28 16:16:39 -07:00
m68k Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2011-01-18 08:05:20 -08:00
m68knommu Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2011-01-18 08:05:20 -08:00
microblaze Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze 2011-01-18 08:06:22 -08:00
mips Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus 2011-01-18 14:28:48 -08:00
mn10300 kernel: clean up USE_GENERIC_SMP_HELPERS 2011-01-13 08:03:08 -08:00
parisc parisc: fix compile breakage caused by inlining maybe_mkwrite 2011-01-16 15:05:44 -08:00
powerpc powerpc/ppc64/tracing: Add stack frame to calls of trace_hardirqs_on/off 2011-01-21 14:08:33 +11:00
s390 Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6 2011-01-14 08:47:26 -08:00
score Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 2010-10-28 16:16:39 -07:00
sh Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6 2011-01-13 20:15:18 -08:00
sparc thp: pte alloc trans splitting 2011-01-13 17:32:40 -08:00
tile arch/tile: handle rt_sigreturn() more cleanly 2010-12-17 16:59:29 -05:00
um thp: pte alloc trans splitting 2011-01-13 17:32:40 -08:00
x86 x86: Unify "numa=" command line option handling 2011-01-19 10:25:18 +01:00
xtensa thp: mm: define MADV_NOHUGEPAGE 2011-01-13 17:32:47 -08:00
.gitignore
Kconfig [S390] mutex: Introduce arch_mutex_cpu_relax() 2011-01-05 12:47:31 +01:00