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

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Date:	Mon, 29 Jun 2009 18:16:03 +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

> Of course that raises the question of whether smp_wmb() is too weak in case of
> !SMP or X86_PPRO_FENCE, but with the described scenario, I don't think
> it does.

I'm pretty sure it is for the Winchip -but we don't care as there are no
SMP ones. OTOH with DMA we do care

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