linux-kernel - Re: [RFC][PATCH v3 1/3] Move kmsg_dump(KMSG_DUMP_PANIC) below smp_send

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Date:	Mon, 12 Dec 2011 11:01:07 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Seiji Aguchi <seiji.aguchi@....com>
Cc:	"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>,
	"Chen, Gong" <gong.chen@...el.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"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 v3 1/3] Move kmsg_dump(KMSG_DUMP_PANIC) below
 smp_send_stop()

On Fri, Dec 02, 2011 at 05:09:32PM -0500, Seiji Aguchi wrote:
> This patch just moves kmsg_dump(KMSG_DUMP_PANIC) below smp_send_stop
> for serializing logging process via smp_send_stop.
> 
>  Signed-off-by: Seiji Aguchi <seiji.aguchi@....com>

This is a useful first step towards serializing the kmsg_dump framework.
It takes a similar approach to kdump and makes writing code here easier.

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

> 
> ---
>  kernel/panic.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/panic.c b/kernel/panic.c
> index b265936..c8e0ae8 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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