tree 799c598208d828e343422d73cb70b74e22f64608
parent 379cfdac37923653c9d4242d10052378b7563005
author Steven Rostedt (Red Hat) <rostedt@goodmis.org> 1401461386 -0400
committer Steven Rostedt <rostedt@goodmis.org> 1401469420 -0400

tracing: Move locking of trace_cmdline_lock into start/stop seq calls

With the conversion of the saved_cmdlines output to use seq_read, there
is now a race between accessing the values of the saved_cmdlines and
the writing to them. The trace_cmdline_lock needs to be taken at
the start and stop of the seq calls.

A new __trace_find_cmdline() call is created to allow for the look up
to happen without taking the lock.

Fixes: 42584c81c5ad tracing: Have saved_cmdlines use the seq_read infrastructure
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>