linux-kernel - [tip:locking/core] locking/pvqspinlock: Avoid double resetting of stats

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Message-ID: <tip-dc209a3fd73ec96d4491bcc128c3b50b0a8e8017@git.kernel.org>
Date:	Thu, 5 May 2016 02:43:41 -0700
From:	tip-bot for Davidlohr Bueso <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, dbueso@...e.de, peterz@...radead.org,
	mingo@...nel.org, tglx@...utronix.de, dave@...olabs.net,
	hpa@...or.com, paulmck@...ux.vnet.ibm.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org
Subject: [tip:locking/core] locking/pvqspinlock: Avoid double resetting of
 stats

Commit-ID:  dc209a3fd73ec96d4491bcc128c3b50b0a8e8017
Gitweb:     http://git.kernel.org/tip/dc209a3fd73ec96d4491bcc128c3b50b0a8e8017
Author:     Davidlohr Bueso <dave@...olabs.net>
AuthorDate: Sun, 17 Apr 2016 23:31:42 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 5 May 2016 09:58:49 +0200

locking/pvqspinlock: Avoid double resetting of stats

... remove the redundant second iteration, this is most
likely a copy/past buglet.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
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>
Cc: dave@...olabs.net
Cc: waiman.long@....com
Link: http://lkml.kernel.org/r/1460961103-24953-2-git-send-email-dave@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/qspinlock_stat.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h
index d734b75..7272233 100644
--- a/kernel/locking/qspinlock_stat.h
+++ b/kernel/locking/qspinlock_stat.h
@@ -191,8 +191,6 @@ static ssize_t qstat_write(struct file *file, const char __user *user_buf,
 
 		for (i = 0 ; i < qstat_num; i++)
 			WRITE_ONCE(ptr[i], 0);
-		for (i = 0 ; i < qstat_num; i++)
-			WRITE_ONCE(ptr[i], 0);
 	}
 	return count;
 }