linux-kernel - Re: [PATCH 2/8] fs/timerfd.c: make use of wait_event_interruptible_locked

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Date:	Fri, 16 Apr 2010 09:10:20 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Michal Nazarewicz <m.nazarewicz@...sung.com>
cc:	linux-usb@...r.kernel.org, Greg KH <greg@...ah.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/8] fs/timerfd.c: make use of
 wait_event_interruptible_locked_irq()

On Fri, 16 Apr 2010, Michal Nazarewicz wrote:

> This patch modifies the fs/timerfd.c to use the newly created
> wait_event_interruptible_locked_irq() macro.  This replaces an open
> code implementation with a single macro call.
> 
> Signed-off-by: Michal Nazarewicz <m.nazarewicz@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  fs/timerfd.c |   25 ++++---------------------
>  1 files changed, 4 insertions(+), 21 deletions(-)
> 
> diff --git a/fs/timerfd.c b/fs/timerfd.c
> index 98158de..b86ab8e 100644
> --- a/fs/timerfd.c
> +++ b/fs/timerfd.c
> @@ -110,31 +110,14 @@ static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
>  	struct timerfd_ctx *ctx = file->private_data;
>  	ssize_t res;
>  	u64 ticks = 0;
> -	DECLARE_WAITQUEUE(wait, current);
>  
>  	if (count < sizeof(ticks))
>  		return -EINVAL;
>  	spin_lock_irq(&ctx->wqh.lock);
> -	res = -EAGAIN;
> -	if (!ctx->ticks && !(file->f_flags & O_NONBLOCK)) {
> -		__add_wait_queue(&ctx->wqh, &wait);
> -		for (res = 0;;) {
> -			set_current_state(TASK_INTERRUPTIBLE);
> -			if (ctx->ticks) {
> -				res = 0;
> -				break;
> -			}
> -			if (signal_pending(current)) {
> -				res = -ERESTARTSYS;
> -				break;
> -			}
> -			spin_unlock_irq(&ctx->wqh.lock);
> -			schedule();
> -			spin_lock_irq(&ctx->wqh.lock);
> -		}
> -		__remove_wait_queue(&ctx->wqh, &wait);
> -		__set_current_state(TASK_RUNNING);
> -	}
> +	if (file->f_flags & O_NONBLOCK)
> +		res = -EAGAIN;
> +	else
> +		res = wait_event_interruptible_locked_irq(ctx->wqh, ctx->ticks);
>  	if (ctx->ticks) {
>  		ticks = ctx->ticks;
>  		if (ctx->expired && ctx->tintv.tv64) {

Looks clean to me.

Acked-By: Davide Libenzi <davidel@...ilserver.org>


- Davide


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