From: Waiman Long <waiman.long@hpe.com>
To: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Cc: <linux-kernel@vger.kernel.org>, <peterz@infradead.org>,
<mingo@redhat.com>
Subject: Re: [PATCH] locking/pvqspinlock: Fix a bug in qstat_read()
Date: Wed, 13 Jul 2016 09:50:42 -0400 [thread overview]
Message-ID: <57864732.4080901@hpe.com> (raw)
In-Reply-To: <1468405414-3700-1-git-send-email-xinhui.pan@linux.vnet.ibm.com>
On 07/13/2016 06:23 AM, Pan Xinhui wrote:
> 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>
> ---
> 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 7b0f1b9..8fa1165 100644
> --- a/kernel/locking/qspinlock_stat.h
> +++ b/kernel/locking/qspinlock_stat.h
> @@ -157,7 +157,6 @@ 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);
> }
Thanks for catching that. The statement shouldn't be there.
Reviewed-by: Waiman Long <Waiman.Long@hpe.com>
next prev parent reply other threads:[~2016-07-13 13:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-13 10:23 [PATCH] locking/pvqspinlock: Fix a bug in qstat_read() Pan Xinhui
2016-07-13 13:50 ` Waiman Long [this message]
2016-08-10 18:06 ` [tip:locking/core] " tip-bot for Pan Xinhui
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