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| author |   Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> | 2016-07-13 18:23:34 +0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-08-10 14:13:29 +0200 |
| commit | c2ace36b884de9330c4149064ae8d212d2e0d9ee (patch) | |
| tree | bd9ffc016134a9315c1d8b65502483298b6a0238 /kernel | |
| parent | locking/pvqspinlock: Fix double hash race (diff) | |
| download | linux-dev-c2ace36b884de9330c4149064ae8d212d2e0d9ee.tar.xz linux-dev-c2ace36b884de9330c4149064ae8d212d2e0d9ee.zip | |
locking/pvqspinlock: Fix a bug in qstat_read()
It's obviously wrong to set stat to NULL. So lets remove it.
Otherwise it is always zero when we check the latency of kick/wake.
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Waiman Long <Waiman.Long@hpe.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1468405414-3700-1-git-send-email-xinhui.pan@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/locking/qspinlock_stat.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h index 22e025309845..b9d031516254 100644 --- a/kernel/locking/qspinlock_stat.h +++ b/kernel/locking/qspinlock_stat.h @@ -153,7 +153,6 @@ static ssize_t qstat_read(struct file *file, char __user *user_buf, */ if ((counter == qstat_pv_latency_kick) || (counter == qstat_pv_latency_wake)) { - stat = 0; if (kicks) stat = DIV_ROUND_CLOSEST_ULL(stat, kicks); } |