From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 8 Oct 2014 16:51:10 +0000 (+0200)
Subject: tracing: Robustify wait loop
X-Git-Tag: omap-for-v3.19/prcm-cleanup~110^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe0e01c77dd9f7a60916aec2149d8a1182baf63c;p=pandora-kernel.git

tracing: Robustify wait loop

The pending nested sleep debugging triggered on the potential stale
TASK_INTERRUPTIBLE in this code.

While there, fix the loop such that we won't revert to a while(1)
yield() 'spin' loop if we ever get a spurious wakeup.

And fix the actual issue by properly terminating the 'wait' loop by
setting TASK_RUNNING.

Link: http://lkml.kernel.org/p/20141008165110.GA14547@worktop.programming.kicks-ass.net

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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