Re: [PATCH] input: Add Nintendo extension controller driver
From: Dmitry Torokhov
Date: Mon May 16 2011 - 18:44:06 EST
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;
> > + 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".
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