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Commit c2ace36b authored by Pan Xinhui's avatar Pan Xinhui Committed by Ingo Molnar
Browse files

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: default avatarPan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarWaiman 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: default avatarIngo Molnar <mingo@kernel.org>
parent 229ce631

kernel/locking/qspinlock_stat.h

+0 −1
Original line number Diff line number Diff line
@@ -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);

		}