linux-kernel - Re: [PATCH] documentation: explain memory barriers

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Message-Id: <20081008183125.2a24e3c2.akpm@linux-foundation.org>
Date:	Wed, 8 Oct 2008 18:31:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chris Snook <csnook@...hat.com>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org
Subject: Re: [PATCH] documentation: explain memory barriers

On Wed, 08 Oct 2008 21:17:58 -0400 Chris Snook <csnook@...hat.com> wrote:

> Randy Dunlap wrote:
> > On Wed, 1 Oct 2008 22:54:04 -0700 Andrew Morton wrote:
> > 
> >> This sequence is repeated three or four times and should be pulled out
> >> into a well-commented function.  That comment should explain the logic
> >> behind the use of these barriers, please.
> > 
> > and on 2008-OCT-08 Ben Hutchings wrote:
> > 
> >> All memory barriers need a comment to explain why and what they're doing.

I approve this message.

> Seriously?  When a barrier is used, it's generally self-evident what 
> it's doing.

fs/buffer.c:sync_buffer().  Have fun.
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