linux-kernel - [tip:x86/apic] Documentation: Document kernel.panic_on_io

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Date:	Sat, 19 Dec 2015 02:14:25 -0800
From:	tip-bot for Hidehiro Kawai <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	vgoyal@...hat.com, linux-kernel@...r.kernel.org, bp@...en8.de,
	uobergfe@...hat.com, bp@...e.de, x86@...nel.org,
	rostedt@...dmis.org, hpa@...or.com, nicolas.iooss_linux@....org,
	masami.hiramatsu.pt@...achi.com, xypron.glpk@....de,
	peterz@...radead.org, cmetcalf@...hip.com, mhocko@...nel.org,
	sjenning@...hat.com, corbet@....net, manfred@...orfullife.com,
	hidehiro.kawai.ez@...achi.com, tglx@...utronix.de, bhe@...hat.com,
	dzickus@...hat.com, ebiederm@...ssion.com, mingo@...nel.org,
	jkosina@...e.cz, akpm@...ux-foundation.org
Subject: [tip:x86/apic] Documentation:
  Document kernel.panic_on_io_nmi sysctl

Commit-ID:  9f318e3fcb1d4c48c26e8ca2ff2a459b82f36a23
Gitweb:     http://git.kernel.org/tip/9f318e3fcb1d4c48c26e8ca2ff2a459b82f36a23
Author:     Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
AuthorDate: Mon, 14 Dec 2015 11:19:14 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 19 Dec 2015 11:07:01 +0100

Documentation: Document 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.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Requested-by: Borislav Petkov <bp@...en8.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Baoquan He <bhe@...hat.com>
Cc: Chris Metcalf <cmetcalf@...hip.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Heinrich Schuchardt <xypron.glpk@....de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Jonathan Corbet <corbet@....net>
Cc: kexec@...ts.infradead.org
Cc: linux-doc@...r.kernel.org
Cc: Manfred Spraul <manfred@...orfullife.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Nicolas Iooss <nicolas.iooss_linux@....org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Seth Jennings <sjenning@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ulrich Obergfell <uobergfe@...hat.com>
Cc: Vivek Goyal <vgoyal@...hat.com>
Cc: x86-ml <x86@...nel.org>
Link: http://lkml.kernel.org/r/20151210014637.25437.71903.stgit@softrs
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 Documentation/sysctl/kernel.txt | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index af70d15..73c6b1e 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 an NMI. This 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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