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[V6 PATCH 6/6] Documentation: Add documentation for kernel.panic_on_io_nmi sysctl

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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@hitachi.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Andrew Morton <akpm@linux-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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[V6 PATCH 0/6] Fix race issues among panic, NMI and crash_kexec Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 02:50 +0100
  [V6 PATCH 5/6] x86/nmi: Fix to save registers for crash dump on  external NMI broadcast Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 02:50 +0100
    Re: [V6 PATCH 5/6] x86/nmi: Fix to save registers for crash dump on  external NMI broadcast kbuild test robot <lkp@intel.com> - 2015-12-10 05:00 +0100
      RE: Re: [V6 PATCH 5/6] x86/nmi: Fix to save registers for crash  dump on external NMI broadcast 河合英宏 / KAWAI，HIDEHIRO   <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 07:40 +0100
        [V6.1 PATCH 5/6] x86/nmi: Fix to save registers for crash dump on  external NMI broadcast Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 08:10 +0100
          Re: [V6.1 PATCH 5/6] x86/nmi: Fix to save registers for crash dump  on external NMI broadcast Borislav Petkov <bp@alien8.de> - 2015-12-11 19:10 +0100
  [V6 PATCH 3/6] kexec: Fix race between panic() and crash_kexec()  called directly Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 02:50 +0100
  [V6 PATCH 1/6] panic/x86: Fix re-entrance problem due to panic on  NMI Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 03:00 +0100
    Re: [V6 PATCH 1/6] panic/x86: Fix re-entrance problem due to panic  on NMI Borislav Petkov <bp@alien8.de> - 2015-12-10 16:50 +0100
      RE: Re: [V6 PATCH 1/6] panic/x86: Fix re-entrance problem due to  panic on NMI 河合英宏 / KAWAI，HIDEHIRO   <hidehiro.kawai.ez@hitachi.com> - 2015-12-11 01:30 +0100
  [V6 PATCH 2/6] panic/x86: Allow CPUs to save registers even if they  are looping in NMI context Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 03:00 +0100
  [V6 PATCH 6/6] Documentation: Add documentation for  kernel.panic_on_io_nmi sysctl Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-12-10 03:00 +0100

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