locking/pvqspinlock: Fix a bug in qstat_read()
authorPan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Wed, 13 Jul 2016 10:23:34 +0000 (18:23 +0800)
committerIngo Molnar <mingo@kernel.org>
Wed, 10 Aug 2016 12:13:29 +0000 (14:13 +0200)
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>
kernel/locking/qspinlock_stat.h

index 22e02530984574a6fee718aad26720516c34d497..b9d0315162540d1236e5e1268f184531d8259114 100644 (file)
@@ -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);
                }