linux-kernel - [tip:locking/core] locking/pvqspinlock: Fix a bug in qstat

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Date:	Wed, 10 Aug 2016 11:06:10 -0700
From:	tip-bot for Pan Xinhui <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	peterz@...radead.org, Waiman.Long@....com, hpa@...or.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	akpm@...ux-foundation.org, tglx@...utronix.de,
	xinhui.pan@...ux.vnet.ibm.com
Subject: [tip:locking/core] locking/pvqspinlock: Fix a bug in qstat_read()

Commit-ID:  c2ace36b884de9330c4149064ae8d212d2e0d9ee
Gitweb:     http://git.kernel.org/tip/c2ace36b884de9330c4149064ae8d212d2e0d9ee
Author:     Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
AuthorDate: Wed, 13 Jul 2016 18:23:34 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 10 Aug 2016 14:13:29 +0200

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@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Waiman Long <Waiman.Long@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.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@...nel.org>
---
 kernel/locking/qspinlock_stat.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h
index 22e0253..b9d0315 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);
 		}