Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining

[Andi Kleen]

On Saturday 25 February 2006 05:20, Bryan O'Sullivan wrote:
> On some platforms, a regular wmb() is not sufficient to guarantee that
> PCI writes have been flushed to the bus if write combining is in effect.

On what platforms?
 
> It does so by way of a new header file, <linux/system.h>.  This header
> can be a site for oft-replicated code from <asm-*/system.h>, but isn't
> just yet.

linux/system.h looks unnatural to me.
 
> We also define a version of wc_wmb() with the required semantics
> on x86_64.

Leaving i386 out in the cold?

-Andi

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