From: "tip-bot2 for Leo Yan" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Leo Yan <leo.yan@linaro.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: locking/urgent] locking/lockdep: Correct calling tracepoints
Date: Wed, 19 May 2021 08:09:00 -0000 [thread overview]
Message-ID: <162141174033.29796.3524122325407732983.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210512120937.90211-1-leo.yan@linaro.org>
The following commit has been merged into the locking/urgent branch of tip:
Commit-ID: 89e70d5c583c55088faa2201d397ee30a15704aa
Gitweb: https://git.kernel.org/tip/89e70d5c583c55088faa2201d397ee30a15704aa
Author: Leo Yan <leo.yan@linaro.org>
AuthorDate: Wed, 12 May 2021 20:09:37 +08:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 18 May 2021 12:53:50 +02:00
locking/lockdep: Correct calling tracepoints
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
---
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 48d736a..7641bd4 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -5736,7 +5736,7 @@ 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;
@@ -5754,7 +5754,7 @@ 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;
prev parent reply other threads:[~2021-05-19 8:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 12:09 [PATCH] locking/lockdep: Correct calling tracepoints Leo Yan
2021-05-12 12:37 ` Peter Zijlstra
2021-05-12 13:32 ` Steven Rostedt
2021-05-12 14:05 ` Peter Zijlstra
2021-05-12 15:14 ` Steven Rostedt
2021-05-12 16:54 ` Peter Zijlstra
2021-05-19 8:09 ` tip-bot2 for Leo Yan [this message]
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