linux-kernel - Re: [RFC][PATCH v2 -next 1/2] Move kmsg_dump(KMSG_DUMP_PANIC) below smp_send

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Message-ID: <20111028182747.GD3452@redhat.com>
Date:	Fri, 28 Oct 2011 14:27:47 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Seiji Aguchi <seiji.aguchi@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Chen, Gong" <gong.chen@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Matthew Garrett <mjg@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"ying.huang@...el.com" <ying.huang@...el.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"hughd@...omium.org" <hughd@...omium.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"namhyung@...il.com" <namhyung@...il.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: Re: [RFC][PATCH v2 -next 1/2] Move kmsg_dump(KMSG_DUMP_PANIC) below
 smp_send_stop()

On Fri, Oct 21, 2011 at 05:20:07PM -0400, Seiji Aguchi wrote:
> This patch is just moving kmsg_dump(KMSG_DUMP_PANIC) below smp_send_stop
> for serializing logging process via smp_send_stop.

I feel it is good to always serialize the logging when we are panic'ing.
So this patch is a step in the right direction.

Acked-by: Don Zickus <dzickus@...hat.com>

> 
>  Signed-off-by: Seiji Aguchi <seiji.aguchi@....com>
> 
> ---
>  kernel/panic.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/panic.c b/kernel/panic.c
> index d7bb697..41bf6ad 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -88,8 +88,6 @@ NORET_TYPE void panic(const char * fmt, ...)
>  	 */
>  	crash_kexec(NULL);
>  
> -	kmsg_dump(KMSG_DUMP_PANIC);
> -
>  	/*
>  	 * Note smp_send_stop is the usual smp shutdown function, which
>  	 * unfortunately means it may not be hardened to work in a panic
> @@ -97,6 +95,8 @@ NORET_TYPE void panic(const char * fmt, ...)
>  	 */
>  	smp_send_stop();
>  
> +	kmsg_dump(KMSG_DUMP_PANIC);
> +
>  	atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
>  
>  	bust_spinlocks(0);
> -- 1.7.1
--
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