From: Steven Rostedt <srostedt@redhat.com>
Date: Wed, 17 Jun 2009 01:22:48 +0000 (-0400)
Subject: ring-buffer: do not grab locks in nmi
X-Git-Tag: v2.6.31-rc1~95^2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d707e8eb4de4b930573155ab4df4b3270ee25dd;p=pandora-kernel.git

ring-buffer: do not grab locks in nmi

If ftrace_dump_on_oops is set, and an NMI detects a lockup, then it
will need to read from the ring buffer. But the read side of the
ring buffer still takes locks. This patch adds a check on the read
side that if it is in an NMI, then it will disable the ring buffer
and not take any locks.

Reads can still happen on a disabled ring buffer.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

Reading git-diff-tree failed