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| author | Alex Shi <alex.shi@linaro.org> | 2017-07-13 14:18:24 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-07-13 11:44:06 +0200 |
| commit | 69f0d429c413fe96db2c187475cebcc6e3a8c7f5 (patch) | |
| tree | 62d0f2cd136b5c2e191c01f5df8b3379ddab6526 /kernel | |
| parent | 5671360f29c68d9079914438f6a0109ef62f82a8 (diff) | |
| download | lwn-69f0d429c413fe96db2c187475cebcc6e3a8c7f5.tar.gz lwn-69f0d429c413fe96db2c187475cebcc6e3a8c7f5.zip | |
locking/rtmutex: Remove unnecessary priority adjustment
We don't need to adjust priority before adding a new pi_waiter, the
priority only needs to be updated after pi_waiter change or task
priority change.
Steven Rostedt pointed out:
"Interesting, I did some git mining and this was added with the original
entry of the rtmutex.c (23f78d4a03c5). Looking at even that version, I
don't see the purpose of adjusting the task prio here. It is done
before anything changes in the task."
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1499926704-28841-1-git-send-email-alex.shi@linaro.org
[ Enhance the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/locking/rtmutex.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index 78069895032a..649dc9d3951a 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -963,7 +963,6 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock, return -EDEADLK; raw_spin_lock(&task->pi_lock); - rt_mutex_adjust_prio(task); waiter->task = task; waiter->lock = lock; waiter->prio = task->prio; |