Re: MMIO and gcc re-ordering (Was: [PATCH] [POWERPC]Improve (in|out)_beXX() asm code)

From: Benjamin Herrenschmidt
Date: Fri May 23 2008 - 18:48:34 EST

On Fri, 2008-05-23 at 16:14 -0500, Scott Wood wrote:

> As Trent pointed out, if you change to eieio in the accessors, that'd
> require drivers to also use mmiowb() before spin_unlock(), which fewer
> drivers currently do.

No, this is a totally different issue. And we keep track of the need
for a sync in spin_unlock already.


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