Steven Rostedt (Red Hat)
52cecaa205
tracing: Fix free of probe entry by calling call_rcu_sched()
...
commit 740466bc89 upstream.
Because function tracing is very invasive, and can even trace
calls to rcu_read_lock(), RCU access in function tracing is done
with preempt_disable_notrace(). This requires a synchronize_sched()
for updates and not a synchronize_rcu().
Function probes (traceon, traceoff, etc) must be freed after
a synchronize_sched() after its entry has been removed from the
hash. But call_rcu() is used. Fix this by using call_rcu_sched().
Also fix the usage to use hlist_del_rcu() instead of hlist_del().
Signed-off-by: Steven Rostedt <rostedt@goodmis.org >
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
2013-03-28 12:12:06 -07:00
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