linux-kernel - Re: [PATCH v3] ad7877: keep dma rx buffers in seperate cache lines

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Message-ID: <AANLkTiniq9gT5-x8tP3SRXvMvTAZ3VJF7pe21OLl1qDH@mail.gmail.com>
Date:	Mon, 10 May 2010 12:39:49 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Oskar Schirmer <os@...ix.com>
Cc:	Michael Hennerich <Michael.Hennerich@...log.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Daniel Glöckner <dg@...ix.com>,
	Oliver Schneidewind <osw@...ix.com>,
	Johannes Weiner <jw@...ix.com>
Subject: Re: [PATCH v3] ad7877: keep dma rx buffers in seperate cache lines

On Mon, May 10, 2010 at 06:42, Oskar Schirmer wrote:
> With dma based spi transmission, data corruption
> is observed occasionally. With dma buffers located
> right next to msg and xfer fields, cache lines
> correctly flushed in preparation for dma usage
> may be polluted again when writing to fields
> in the same cache line.
>
> Make sure cache fields used with dma do not
> share cache lines with fields changed during
> dma handling. As both fields are part of a
> struct that is allocated via kzalloc, thus
> cache aligned, moving the fields to the 1st
> position and insert padding for alignment
> does the job.

Acked-by: Mike Frysinger <vapier@...too.org>

i'm guessing Dmitry will pick it up now
-mike
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