linux-kernel - Re: [PATCH] call stop_machine_text

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Message-ID: <4CCA4BFD.3020302@hitachi.com>
Date:	Fri, 29 Oct 2010 13:22:21 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	mathieu.desnoyers@...ymtl.ca, hpa@...or.com, tglx@...utronix.de,
	andi@...stfloor.org, fweisbec@...il.com, rostedt@...dmis.org,
	mingo@...e.hu, linux-kernel@...r.kernel.org,
	2nddept-manager@....hitachi.co.jp
Subject: Re: [PATCH] call stop_machine_text_poke() on all cpus

(2010/10/29 0:20), Jason Baron wrote:
> Currently, text_poke_smp() passes a NULL as the third argument to
> __stop_machine(), which will only run stop_machine_text_poke()
> on 1 cpu. Change NULL -> cpu_online_mask, as stop_machine_text_poke()
> is intended to be run on all cpus.

That should be my misunderstand...

> 
> I actually didn't notice any problems with stop_machine_text_poke()
> only being called on 1 cpu, but found this via code inspection.

Thank you very much!

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

> 
> Signed-off-by: Jason Baron <jbaron@...hat.com>
> ---
>  arch/x86/kernel/alternative.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
> index 9f39a1c..3c3f26f 100644
> --- a/arch/x86/kernel/alternative.c
> +++ b/arch/x86/kernel/alternative.c
> @@ -705,6 +705,6 @@ void *__kprobes text_poke_smp(void *addr, const void *opcode, size_t len)
>  	atomic_set(&stop_machine_first, 1);
>  	wrote_text = 0;
>  	/* Use __stop_machine() because the caller already got online_cpus. */
> -	__stop_machine(stop_machine_text_poke, (void *)&tpp, NULL);
> +	__stop_machine(stop_machine_text_poke, (void *)&tpp, cpu_online_mask);
>  	return addr;
>  }


-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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