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

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Date:	Fri, 10 Jul 2015 20:33:31 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>
Cc:	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: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump is
 not available

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.

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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