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

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Message-ID: <20090629192456.GC9401@amd.com>
Date:	Mon, 29 Jun 2009 21:24:56 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
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

On Mon, Jun 29, 2009 at 08:10:26PM +0100, Alan Cox wrote:
> > 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.

Ah ok, thanks. I think we should document that somewhere. A help text for the
Kconfig entry comes to my mind for that purpose. I will send a patch for this.

	Joerg

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