Commit-ID: c2ace36b884de9330c4149064ae8d212d2e0d9ee Gitweb: http://git.kernel.org/tip/c2ace36b884de9330c4149064ae8d212d2e0d9ee Author: Pan Xinhui <xinhui....@linux.vnet.ibm.com> AuthorDate: Wed, 13 Jul 2016 18:23:34 +0800 Committer: Ingo Molnar <mi...@kernel.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....@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Reviewed-by: Waiman Long <waiman.l...@hpe.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Link: http://lkml.kernel.org/r/1468405414-3700-1-git-send-email-xinhui....@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mi...@kernel.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); }
