commit 4ca530852346be239b7c19e7bec5d2b78855bebe
author Steven Rostedt <srostedt@redhat.com> Mon Mar 16 19:20:15 2009 -0400
committer Steven Rostedt <srostedt@redhat.com> Mon Mar 16 23:27:06 2009 -0400
tree 96e5252faaf362115a96ed6df7c4e4f698a027dc
parent 03303549b1695dc024d4a653cc16bd79f78f9750

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>