From: Steven Rostedt <srostedt@redhat.com>
Date: Fri, 17 Apr 2009 20:13:55 +0000 (-0400)
Subject: tracing: protect trace_printk from recursion
X-Git-Tag: v2.6.31-rc1~401^2~139
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3189cdb31622f4e40688ce5a6fc5d940b42bc805;p=pandora-kernel.git

tracing: protect trace_printk from recursion

trace_printk can be called from any context, including NMIs.
If this happens, then we must test for for recursion before
grabbing any spinlocks.

This patch prevents trace_printk from being called recursively.

[ Impact: prevent hard lockup in lockdep event tracer ]

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

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