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livepatch: Replace synchronize_sched() with synchronize_rcu()
Now that synchronize_rcu() waits for preempt-disable regions of code as well as RCU read-side critical sections, synchronize_sched() can be replaced by synchronize_rcu(). This commit therefore makes this change, even though it is but a comment. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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2af3024cd7
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6932689e41
2 changed files with 4 additions and 4 deletions
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@ -61,7 +61,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
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ops = container_of(fops, struct klp_ops, fops);
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/*
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* A variant of synchronize_sched() is used to allow patching functions
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* A variant of synchronize_rcu() is used to allow patching functions
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* where RCU is not watching, see klp_synchronize_transition().
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*/
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preempt_disable_notrace();
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@ -72,7 +72,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
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/*
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* func should never be NULL because preemption should be disabled here
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* and unregister_ftrace_function() does the equivalent of a
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* synchronize_sched() before the func_stack removal.
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* synchronize_rcu() before the func_stack removal.
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*/
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if (WARN_ON_ONCE(!func))
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goto unlock;
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