linux-kernel - Re: [PATCH] Document Linux's circular buffering capabilities

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Message-ID: <4B9E396E.8050606@s5r6.in-berlin.de>
Date:	Mon, 15 Mar 2010 14:43:10 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	David Howells <dhowells@...hat.com>
CC:	torvalds@...l.org, akpm@...ux-foundation.org, sgruszka@...hat.com,
	davem@...emloft.net, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH] Document Linux's circular buffering capabilities

David Howells wrote:
> How about adding a bit:
> 
>  Note the use of ACCESS_ONCE() in both algorithms to read the opposition index.
>  This prevents the compiler from discarding and reloading its cached value -
> -which some compilers will do across smp_read_barrier_depends().
> +which some compilers will do across smp_read_barrier_depends().  This isn't
> +strictly needed if you can be sure that the opposition index will _only_ be
> +used the once.

Yes, thanks.  (The last "the" is superfluous.)
-- 
Stefan Richter
-=====-==-=- --== -====
http://arcgraph.de/sr/
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