From: Steven Rostedt <srostedt@redhat.com>
Date: Tue, 2 Jun 2009 18:01:19 +0000 (-0400)
Subject: function-graph: add memory barriers for accessing task's ret_stack
X-Git-Tag: v2.6.31-rc1~400^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26c01624a2a40f8a4ddf6449b65c9b1c418d0e72;p=pandora-kernel.git

function-graph: add memory barriers for accessing task's ret_stack

The code that handles the tasks ret_stack allocation for every task
assumes that only an interrupt can cause issues (even though interrupts
are disabled).

In reality, the code is allocating the ret_stack for tasks that may be
running on other CPUs and there are not efficient memory barriers to
handle this case.

[ Impact: prevent crash due to using of uninitialized ret_stack variables ]

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