linux-kernel - Re: [PATCH 1/3] panic: Disable crash_kexec_post

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Message-ID: <20150714135919.GA18333@fifo99.com>
Date:	Tue, 14 Jul 2015 13:59:19 +0000
From:	dwalker@...o99.com
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>, linux-mips@...ux-mips.org,
	Baoquan He <bhe@...hat.com>, linux-sh@...r.kernel.org,
	linux-s390@...r.kernel.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-metag@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump
 is not available

On Mon, Jul 13, 2015 at 08:19:45PM -0500, Eric W. Biederman wrote:
> dwalker@...o99.com writes:
> 
> > On Fri, Jul 10, 2015 at 08:41:28AM -0500, Eric W. Biederman wrote:
> >> Hidehiro Kawai <hidehiro.kawai.ez@...achi.com> writes:
> >> 
> >> > You can call panic notifiers and kmsg dumpers before kdump by
> >> > specifying "crash_kexec_post_notifiers" as a boot parameter.
> >> > However, it doesn't make sense if kdump is not available.  In that
> >> > case, disable "crash_kexec_post_notifiers" boot parameter so that
> >> > you can't change the value of the parameter.
> >> 
> >> Nacked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> >
> > I think it would make sense if he just replaced "kdump" with "kexec".
> 
> It would be less insane, however it still makes no sense as without
> kexec on panic support crash_kexec is a noop.  So the value of the
> seeting makes no difference.

Can you explain more, I don't really understand what you mean. Are you suggesting
the whole "crash_kexec_post_notifiers" feature has no value ?

Daniel
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