From: Sasha Levin <levinsasha928@gmail.com>
Date: Thu, 15 Mar 2012 21:47:20 +0000 (-0400)
Subject: hung task debugging: Inject NMI when hung and going to panic
X-Git-Tag: v3.5-rc1~165^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=625056b65ee9a8b4caf42136e0c844c15e6ec54f;p=pandora-kernel.git

hung task debugging: Inject NMI when hung and going to panic

Send an NMI to all CPUs when a hung task is detected and the hung
task code is configured to panic. This gives us a fairly uptodate
snapshot of all CPUs in the system.

This lets us get stack trace of all CPUs which makes life easier
trying to debug a deadlock, and the NMI doesn't change anything
since the next step is a kernel panic.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1331848040-1676-1-git-send-email-levinsasha928@gmail.com
[ extended the changelog a bit ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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