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

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Date:	Fri, 10 Jul 2015 08:41:28 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	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>,
	Daniel Walker <dwalker@...o99.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

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>

You are confusing kexec on panic and CONFIG_CRASH_DUMP
which is about the tools for reading the state of the previous kernel.

Eric

> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Eric Biederman <ebiederm@...ssion.com>
> Cc: Vivek Goyal <vgoyal@...hat.com>
> ---
>  kernel/panic.c |    2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/kernel/panic.c b/kernel/panic.c
> index 04e91ff..5252331 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -502,12 +502,14 @@ __visible void __stack_chk_fail(void)
>  core_param(pause_on_oops, pause_on_oops, int, 0644);
>  core_param(panic_on_warn, panic_on_warn, int, 0644);
>  
> +#ifdef CONFIG_CRASH_DUMP
>  static int __init setup_crash_kexec_post_notifiers(char *s)
>  {
>  	crash_kexec_post_notifiers = true;
>  	return 0;
>  }
>  early_param("crash_kexec_post_notifiers", setup_crash_kexec_post_notifiers);
> +#endif
>  
>  static int __init oops_setup(char *s)
>  {
--
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