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Message-Id: <1364311249-14454-72-git-send-email-luis.henriques@canonical.com> Date: Tue, 26 Mar 2013 15:19:30 +0000 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>, Steven Rostedt <rostedt@...dmis.org>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 071/150] tracing: Fix free of probe entry by calling call_rcu_sched() 3.5.7.9 -stable review patch. If anyone has any objections, please let me know. ------------------ From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org> commit 740466bc89ad8bd5afcc8de220f715f62b21e365 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(). Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com> Signed-off-by: Steven Rostedt <rostedt@...dmis.org> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- kernel/trace/ftrace.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index e5a77ba..1b6ec54 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -3002,8 +3002,8 @@ __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(); -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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