linux-kernel - [PATCH v7 10/23] locking/lockdep: Update two outdated comments

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Message-Id: <20190214230058.196511-11-bvanassche@acm.org>
Date:   Thu, 14 Feb 2019 15:00:45 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     peterz@...radead.org
Cc:     mingo@...hat.com, will.deacon@....com, tj@...nel.org,
        longman@...hat.com, johannes.berg@...el.com,
        linux-kernel@...r.kernel.org, Bart Van Assche <bvanassche@....org>,
        Johannes Berg <johannes@...solutions.net>
Subject: [PATCH v7 10/23] locking/lockdep: Update two outdated comments

synchronize_sched() has been removed recently. Update the comments that
refer to synchronize_sched().

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Waiman Long <longman@...hat.com>
Cc: Johannes Berg <johannes@...solutions.net>
Fixes: 51959d85f32d ("lockdep: Replace synchronize_sched() with synchronize_rcu()") # v5.0-rc1
Signed-off-by: Bart Van Assche <bvanassche@....org>
---
 kernel/locking/lockdep.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 42161b8f0e68..4bab8ecb88be 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4200,9 +4200,9 @@ static void __lockdep_free_key_range(void *start, unsigned long size)
  * Used in module.c to remove lock classes from memory that is going to be
  * freed; and possibly re-used by other modules.
  *
- * We will have had one sync_sched() before getting here, so we're guaranteed
- * nobody will look up these exact classes -- they're properly dead but still
- * allocated.
+ * We will have had one synchronize_rcu() before getting here, so we're
+ * guaranteed nobody will look up these exact classes -- they're properly dead
+ * but still allocated.
  */
 void lockdep_free_key_range(void *start, unsigned long size)
 {
@@ -4221,8 +4221,6 @@ void lockdep_free_key_range(void *start, unsigned long size)
 	/*
 	 * Wait for any possible iterators from look_up_lock_class() to pass
 	 * before continuing to free the memory they refer to.
-	 *
-	 * sync_sched() is sufficient because the read-side is IRQ disable.
 	 */
 	synchronize_rcu();
 
-- 
2.21.0.rc0.258.g878e2cd30e-goog