linux-kernel - Re: [PATCH 4/9] firewire: don't use PREPARE_DELAYED

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Message-ID: <20140221165730.GA10929@htj.dyndns.org>
Date:	Fri, 21 Feb 2014 11:57:30 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	laijs@...fujitsu.com, linux-kernel@...r.kernel.org,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux1394-devel@...ts.sourceforge.net,
	Chris Boot <bootc@...tc.net>, linux-scsi@...r.kernel.org,
	target-devel@...r.kernel.org
Subject: Re: [PATCH 4/9] firewire: don't use PREPARE_DELAYED_WORK

Yo,

On Fri, Feb 21, 2014 at 11:53:46AM -0500, Peter Hurley wrote:
> Ok, I can do that. But AFAIK it'll have to be an smp_rmb(); there is
> no mb__after unlock.

We do have smp_mb__after_unlock_lock().

> [ After thinking about it some, I don't think preventing speculative
>   writes before clearing PENDING if useful or necessary, so that's
>   why I'm suggesting only the rmb. ]

But smp_mb__after_unlock_lock() would be cheaper on most popular
archs, I think.

Thanks.

-- 
tejun
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