From: Steven Rostedt <srostedt@redhat.com>
Date: Mon, 16 Mar 2009 23:20:15 +0000 (-0400)
Subject: tracing: protect reader of cmdline output
X-Git-Tag: v2.6.30-rc1~2^2~29^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ca530852346be239b7c19e7bec5d2b78855bebe;p=pandora-kernel.git

tracing: protect reader of cmdline output

Impact: fix to one cause of incorrect comm outputs in trace

The spinlock only protected the creation of a comm <=> pid pair.
But it was possible that a reader could look up a pid, and get the
wrong comm because it had no locking.

This also required changing trace_find_cmdline to copy the comm cache
and not just send back a pointer to it.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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