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>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c
index 82d584225dc6..7702cb4064fc 100644
--- a/kernel/livepatch/patch.c
+++ b/kernel/livepatch/patch.c
@@ -61,7 +61,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
         ops = container_of(fops, struct klp_ops, fops);
 
         /*
-         * A variant of synchronize_sched() is used to allow patching functions
+         * A variant of synchronize_rcu() is used to allow patching functions
          * where RCU is not watching, see klp_synchronize_transition().
          */
         preempt_disable_notrace();
@@ -72,7 +72,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
         /*
          * func should never be NULL because preemption should be disabled here
          * and unregister_ftrace_function() does the equivalent of a
-         * synchronize_sched() before the func_stack removal.
+         * synchronize_rcu() before the func_stack removal.
          */
         if (WARN_ON_ONCE(!func))
                 goto unlock;