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

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Message-ID: <20090629201026.0f351013@lxorguk.ukuu.org.uk>
Date:	Mon, 29 Jun 2009 20:10:26 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Arnd Bergmann <arnd@...db.de>, 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

> X86_OOSTORE is defined for (MWINCHIP3D || MWINCHIPC6) && MTRR. I am not sure if
> these chips have sfence.
> It would also help to know what OOSTORE exactly means in the context of that
> chip.

Non uncached stores may be visible out of order on the bus.

Alan
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