From: Leo Yan leo.yan@linaro.org
[ Upstream commit 89e70d5c583c55088faa2201d397ee30a15704aa ]
The commit eb1f00237aca ("lockdep,trace: Expose tracepoints") reverses tracepoints for lock_contended() and lock_acquired(), thus the ftrace log shows the wrong locking sequence that "acquired" event is prior to "contended" event:
<idle>-0 [001] d.s3 20803.501685: lock_acquire: 0000000008b91ab4 &sg_policy->update_lock <idle>-0 [001] d.s3 20803.501686: lock_acquired: 0000000008b91ab4 &sg_policy->update_lock <idle>-0 [001] d.s3 20803.501689: lock_contended: 0000000008b91ab4 &sg_policy->update_lock <idle>-0 [001] d.s3 20803.501690: lock_release: 0000000008b91ab4 &sg_policy->update_lock
This patch fixes calling tracepoints for lock_contended() and lock_acquired().
Fixes: eb1f00237aca ("lockdep,trace: Expose tracepoints") Signed-off-by: Leo Yan leo.yan@linaro.org Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Link: https://lkml.kernel.org/r/20210512120937.90211-1-leo.yan@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/locking/lockdep.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 38d7c03e694c..858b96b438ce 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -5664,7 +5664,7 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip) { unsigned long flags;
- trace_lock_acquired(lock, ip); + trace_lock_contended(lock, ip);
if (unlikely(!lock_stat || !lockdep_enabled())) return; @@ -5682,7 +5682,7 @@ void lock_acquired(struct lockdep_map *lock, unsigned long ip) { unsigned long flags;
- trace_lock_contended(lock, ip); + trace_lock_acquired(lock, ip);
if (unlikely(!lock_stat || !lockdep_enabled())) return;