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Kevin Hao 1a18a66446 powerpc: Set the correct ksp_limit on ppc32 when switching to irq stack 
Guenter Roeck has got the following call trace on a p2020 board:
  Kernel stack overflow in process eb3e5a00, r1=eb79df90
  CPU: 0 PID: 2838 Comm: ssh Not tainted 3.13.0-rc8-juniper-00146-g19eca00 #4
  task: eb3e5a00 ti: c0616000 task.ti: ef440000
  NIP: c003a420 LR: c003a410 CTR: c0017518
  REGS: eb79dee0 TRAP: 0901   Not tainted (3.13.0-rc8-juniper-00146-g19eca00)
  MSR: 00029000 <CE,EE,ME>  CR: 24008444  XER: 00000000
  GPR00: c003a410 eb79df90 eb3e5a00 00000000 eb05d900 00000001 65d87646 00000000
  GPR08: 00000000 020b8000 00000000 00000000 44008442
  NIP [c003a420] __do_softirq+0x94/0x1ec
  LR [c003a410] __do_softirq+0x84/0x1ec
  Call Trace:
  [eb79df90] [c003a410] __do_softirq+0x84/0x1ec (unreliable)
  [eb79dfe0] [c003a970] irq_exit+0xbc/0xc8
  [eb79dff0] [c000cc1c] call_do_irq+0x24/0x3c
  [ef441f20] [c00046a8] do_IRQ+0x8c/0xf8
  [ef441f40] [c000e7f4] ret_from_except+0x0/0x18
  --- Exception: 501 at 0xfcda524
      LR = 0x10024900
  Instruction dump:
  7c781b78 3b40000a 3a73b040 543c0024 3a800000 3b3913a0 7ef5bb78 48201bf9
  5463103a 7d3b182e 7e89b92e 7c008146 <3ba00000> 7e7e9b78 48000014 57fff87f
  Kernel panic - not syncing: kernel stack overflow
  CPU: 0 PID: 2838 Comm: ssh Not tainted 3.13.0-rc8-juniper-00146-g19eca00 #4
  Call Trace:

The reason is that we have used the wrong register to calculate the
ksp_limit in commit cbc9565ee8 (powerpc: Remove ksp_limit on ppc64).
Just fix it.

As suggested by Benjamin Herrenschmidt, also add the C prototype of the
function in the comment in order to avoid such kind of errors in the
future.

Cc: stable@vger.kernel.org # 3.12
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
 		2014-02-17 11:19:34 +11:00
..
alpha alpha: fix broken network checksum 2014-01-31 09:21:55 -08:00
arc Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-01-30 16:58:05 -08:00
arm ARM: SoC fixes for 3.14-rc1 2014-02-02 11:11:06 -08:00
arm64 arm64: defconfig: Expand default enabled features 2014-02-07 17:17:28 +00:00
avr32
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blackfin Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-01-31 09:31:14 -08:00
c6x
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cris
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frv Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-01-30 16:58:05 -08:00
hexagon
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ia64
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m32r
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m68k Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block 2014-01-30 11:19:05 -08:00
metag
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microblaze
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mips MIPS: fpu.h: Fix build when CONFIG_BUG is not set 2014-02-06 13:42:43 +01:00
mn10300 Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-01-30 16:58:05 -08:00
openrisc OpenRISC updates for 3.14 2014-01-30 17:08:41 -08:00
parisc execve: use 'struct filename *' for executable name passing 2014-02-05 12:54:53 -08:00
powerpc powerpc: Set the correct ksp_limit on ppc32 when switching to irq stack 2014-02-17 11:19:34 +11:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2014-02-05 15:51:42 -08:00
score Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-01-31 09:31:14 -08:00
sh
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sparc sparc: Hook up sched_setattr and sched_getattr syscalls. 2014-01-29 00:45:06 -08:00
tile tile: remove compat_sys_lookup_dcookie declaration to fix compile error 2014-02-01 10:55:15 -08:00
um
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unicore32
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x86 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-02-08 11:54:43 -08:00
xtensa Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block 2014-01-30 11:19:05 -08:00
.gitignore
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Kconfig
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