diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c index b552cf2d85f83ad46c5f94aa90d6fd068befd529..6c0164d24bbdac95c2eaca6e0f209c19afae8cde 100644 --- a/kernel/livepatch/patch.c +++ b/kernel/livepatch/patch.c @@ -45,9 +45,13 @@ static void notrace klp_ftrace_handler(unsigned long ip, struct klp_ops *ops; struct klp_func *func; int patch_state; + int bit; ops = container_of(fops, struct klp_ops, fops); + bit = ftrace_test_recursion_trylock(); + if (bit < 0) + return; /* * A variant of synchronize_rcu() is used to allow patching functions * where RCU is not watching, see klp_synchronize_transition(). @@ -117,6 +121,7 @@ static void notrace klp_ftrace_handler(unsigned long ip, unlock: preempt_enable_notrace(); + ftrace_test_recursion_unlock(bit); } /*