linux-kernel - Re: [PATCH] [POWERPC] Improve (in|out)

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Message-ID: <20080520231516.76b924a2@core>
Date:	Tue, 20 May 2008 23:15:16 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Scott Wood <scottwood@...escale.com>
Cc:	benh@...nel.crashing.org, Trent Piepho <tpiepho@...escale.com>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [POWERPC] Improve (in|out)_beXX() asm code

> It looks like we rely on -fno-strict-aliasing to prevent reordering 
> ordinary memory accesses (such as to DMA descriptors) past the I/O 

DMA descriptors in main memory are dependant on cache behaviour anyway
and the dma_* operators should be the ones enforcing the needed behaviour.

Alan
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