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jump_label: jump_label_inc may return before the code is patched
If cpu A calls jump_label_inc() just after atomic_add_return() is called by cpu B, atomic_inc_not_zero() will return value greater then zero and jump_label_inc() will return to a caller before jump_label_update() finishes its job on cpu B. Link: http://lkml.kernel.org/r/20111018175551.GH17571@redhat.com Cc: stable@vger.kernel.org Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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@ -66,8 +66,9 @@ void jump_label_inc(struct jump_label_key *key)
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return;
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jump_label_lock();
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if (atomic_add_return(1, &key->enabled) == 1)
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if (atomic_read(&key->enabled) == 0)
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jump_label_update(key, JUMP_LABEL_ENABLE);
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atomic_inc(&key->enabled);
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jump_label_unlock();
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}
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