Re: [PATCH] input: Add Nintendo extension controller driver
From: Grant Likely
Date: Mon May 16 2011 - 19:04:29 EST
On Mon, May 16, 2011 at 4:43 PM, Dmitry Torokhov
> 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".
Fixed and tested, thanks.
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