linux-kernel - Re: [PATCH 2/2] Block: use round_jiffies

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Date:	Wed, 5 Nov 2008 11:21:49 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tejun Heo <tj@...nel.org>
cc:	Jens Axboe <jens.axboe@...cle.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Block: use round_jiffies_up()

On Wed, 5 Nov 2008, Tejun Heo wrote:

> Hello,
> 
> Alan Stern wrote:
> > @@ -78,13 +78,14 @@ void blk_delete_timer(struct request *re
> >  	/*
> >  	 * Nothing to detach
> >  	 */
> > -	if (!q->rq_timed_out_fn || !req->deadline)
> > +	if (!req->deadline)
> >  		return;
> >  
> >  	list_del_init(&req->timeout_list);
> >  
> >  	if (list_empty(&q->timeout_list))
> >  		del_timer(&q->timeout);
> > +	req->deadline = 0;
> >  }
> 
> Actually, this can just be
> 
> blk_delete_timer()
> {
> 	list_del_init(&req->timeout_list);
> 	if (list_empty(&q->timeout_list))
> 		del_timer(&q->timeout);
> }
> 
> and none of req->deadline trick is necessary.

True.  And if we do this, then there's no need to test and increment
req->deadline in blk_add_timer().

Alan Stern

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