Subject: Re: [v3 PATCH 0/3] ppc32/kprobe: Fix a bug for kprobe stwu r1

From: "tiejun.chen" <[email-masked]>
Date: Sun, 3 Jun 2012 13:14:21 +0800

On 06/03/2012 01:07 PM, Tiejun Chen wrote:
> Changes from V2:
> 
> * populate those existed codes to reorganize codes
> * add check if we'll trigger kernel stack over flow

BTW, I always validate this on mpc8536ds(UP)/mpc8572ds(SMP) with/without
CONFIG_PREEMPT.

Tiejun

> 
> Changes from V1:
> 
> * use memcpy simply to withdraw copy_exc_stack
> * add !(regs->msr & MSR_PR)) and
> 	WARN_ON(test_thread_flag(TIF_EMULATE_STACK_STORE));
>   to make sure we're in goot path.
> * move this migration process inside 'restore'
> * clear TIF flag atomically 
> 
> Tiejun Chen (3):
>       powerpc/kprobe: introduce a new thread flag
>       ppc32/kprobe: complete kprobe and migrate exception frame
>       ppc32/kprobe: don't emulate store when kprobe stwu r1
> 
>  arch/powerpc/include/asm/thread_info.h |    3 ++
>  arch/powerpc/kernel/entry_32.S         |   43 ++++++++++++++++++++++++++-----
>  arch/powerpc/lib/sstep.c               |   37 ++++++++++++++++++++++++++-
>  3 files changed, 74 insertions(+), 9 deletions(-)
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