linux-kernel - Re: [RFC][PATCH] Replace a function call chain of kmsg_dump(KMSG_DUMP

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Message-ID: <20110718114334.GA31986@redhat.com>
Date:	Mon, 18 Jul 2011 07:43:34 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Seiji Aguchi <seiji.aguchi@....com>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Americo Wang <xiyou.wangcong@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jarod Wilson <jwilson@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: Re: [RFC][PATCH] Replace a function call chain of
 kmsg_dump(KMSG_DUMP_KEXEC) with static function calls

On Sat, Jul 16, 2011 at 09:16:06AM -0700, Eric W. Biederman wrote:

[..]
> Am I wrong in thinking that the core motivation behind this patch is
> that our EFI support sucks and thus kdump on EFI does not work on some
> platforms?

One of the arguments seems is that kdump might not work 100% of the
time and saving kernel messages atleast gets some information out
reliably.

I think being able to save dmesg to NVRAM, in general sounds good to
me (if done in a relatively clean manner). Especially if we can get
rid of code taking locks and code path executed after crash is not
tool long and relatively easy to audit.

Thanks
Vivek
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