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rcu: Make rcu_is_watching() really notrace

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Although rcu_is_watching() is marked notrace, it invokes preempt_disable()
and preempt_enable(), both of which can be traced.  This defeats the
purpose of the notrace on rcu_is_watching(), so this commit substitutes
preempt_disable_notrace() and preempt_enable_notrace().

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Alexei Starovoitov 2015-06-16 10:35:18 -07:00 committed by Paul E. McKenney
parent 779de6ce54
commit 46f00d18fc
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree.c
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@ -978,9 +978,9 @@ bool notrace rcu_is_watching(void)
{
bool ret;
preempt_disable();
preempt_disable_notrace();
ret = __rcu_is_watching();
preempt_enable();
preempt_enable_notrace();
return ret;
}
EXPORT_SYMBOL_GPL(rcu_is_watching);