linux-kernel - [V6 PATCH 6/6] Documentation: Add documentation for kernel.panic_on_io

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Date:	Thu, 10 Dec 2015 10:46:37 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	Jonathan Corbet <corbet@....net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vivek Goyal <vgoyal@...hat.com>
Cc:	Baoquan He <bhe@...hat.com>, linux-doc@...r.kernel.org,
	x86@...nel.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Michal Hocko <mhocko@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: [V6 PATCH 6/6] Documentation: Add documentation for
 kernel.panic_on_io_nmi sysctl

kernel.panic_on_io_nmi sysctl was introduced by commit 5211a242d0cb
("x86: Add sysctl to allow panic on IOCK NMI error"), but its
documentation is missing. So, add it.

V6:
- Newly added

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 Documentation/sysctl/kernel.txt |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index af70d15..235f804 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -551,6 +551,21 @@ the recommended setting is 60.
 
 ==============================================================
 
+panic_on_io_nmi:
+
+Controls the kernel's behavior when a CPU receives an NMI caused by
+an IO error.
+
+0: try to continue operation (default)
+
+1: panic immediately. The IO error triggered NMI indicates a serious
+   system condition, which could result in IO data corruption. Rather
+   than continuing, panicking might be a better choice. Some servers
+   issue this sort of NMI when the dump button is pushed, and you
+   can use this option to take a crash dump
+
+==============================================================
+
 panic_on_oops:
 
 Controls the kernel's behaviour when an oops or BUG is encountered.


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