From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Ben Dooks <ben@trinity.fluff.org>
Cc: Grant Likely <grant.likely@secretlab.ca>,
simon@mungewell.org, linux-input@vger.kernel.org,
linux-kernel@vger.kernel.org, OliverNeukumoliver@neukum.org
Subject: Re: [PATCH] input: Add Nintendo extension controller driver
Date: Mon, 16 May 2011 15:43:53 -0700 [thread overview]
Message-ID: <20110516224353.GA19481@core.coreip.homeip.net> (raw)
In-Reply-To: <20110516215110.GE16731@trinity.fluff.org>
On Mon, May 16, 2011 at 10:51:10PM +0100, Ben Dooks wrote:
> On Mon, May 16, 2011 at 03:46:08PM -0600, Grant Likely wrote:
> > +
> > + /*
> > + * DMA buffer, with padding to give it its own cache line so that
> > + * the DMA streaming works on non-coherent architectures.
> > + * Question: Is this the proper pattern, and is this really necessary?
> > + */
> > + uint8_t pad1[L1_CACHE_BYTES];
> > + uint8_t buf[6];
> > + uint8_t pad2[L1_CACHE_BYTES];
> > +};
>
> I think there's an attribute to do this, starting with an __ defined
> in the kernel.
>
Yes, it is called "____cacheline_aligned".
--
Dmitry
next prev parent reply other threads:[~2011-05-16 22:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-16 21:46 [PATCH] input: Add Nintendo extension controller driver Grant Likely
2011-05-16 21:51 ` Ben Dooks
2011-05-16 22:43 ` Dmitry Torokhov [this message]
2011-05-16 23:04 ` Grant Likely
2011-05-16 21:56 ` Grant Likely
2011-05-23 20:50 ` Peter Korsgaard
2011-05-27 8:01 ` Grant Likely
-- strict thread matches above, loose matches on Subject: below --
2011-05-27 8:14 Grant Likely
2011-08-01 16:04 ` Grant Likely
2011-08-01 16:38 ` Dmitry Torokhov
2011-08-01 16:44 ` Grant Likely
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