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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-03-13 11:15:19 -0400
committerSteven Rostedt <rostedt@rostedt.homelinux.com>2013-03-13 17:57:44 -0400
commit740466bc89ad8bd5afcc8de220f715f62b21e365 (patch)
treee2226505f6f4d248adbd7fb448f40e949f899126 /kernel
parent2721e72dd10f71a3ba90f59781becf02638aa0d9 (diff)
downloadlinux-740466bc89ad8bd5afcc8de220f715f62b21e365.tar.bz2
tracing: Fix free of probe entry by calling call_rcu_sched()
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(). Cc: stable@vger.kernel.org Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/ftrace.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 98ca94a41819..e6effd0c40a9 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3108,8 +3108,8 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
continue;
}
- hlist_del(&entry->node);
- call_rcu(&entry->rcu, ftrace_free_entry_rcu);
+ hlist_del_rcu(&entry->node);
+ call_rcu_sched(&entry->rcu, ftrace_free_entry_rcu);
}
}
__disable_ftrace_function_probe();