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SubjectRe: [PATCH] powerpc/irq: Remove HAVE_IRQ_EXIT_ON_IRQ_STACK feature at powerpc platform
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On Fri, 2014-03-28 at 16:18 +0800, Kevin Hao wrote:

> powerpc: Set the correct ksp_limit on ppc32 when switching to irq stack
>

Kevin. It looks like it was applied to 3.14 and sent to 3.12 stable but
not 3.13 ... can you fix that up ?

Cheers,
Ben.

> 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 cbc9565ee826 (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>
>
> Thanks,
> Kevin




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