linux-kernel - Re: [PATCH][RFC] asm-generic:remove calling flush_write_buffers() in dma_sync_*_for

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Message-ID: <20090630140945.0784e174@lxorguk.ukuu.org.uk>
Date:	Tue, 30 Jun 2009 14:09:45 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Joerg Roedel <joerg.roedel@....com>, tom.leiming@...il.com,
	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH][RFC] asm-generic:remove calling flush_write_buffers()
 in dma_sync_*_for_cpu

> > What about non x86 - this is asm-generic you are playing with and its the
> > kind of change that causes evil really hard to track down and subtle
> > corruptions and user data loss if you get it wrong.
> 
> Non-x86 is the real motivation for the patch, because the flush_write_buffers
> call in this file is currently not implemented and causes build errors
> on everything but x86, frv, ia64 and m32r, where the latter two implement
> it as an empty macro.

Ok so the FRV would grow a similar no iommu patch to the x86.

> The only users of the file right now are x86 and ia64, and ia64 only added
> the empty flush_write_buffers() definition in order to use it.

That now all makes sense.
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