Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH] Define wc_wmb, a write barrier for PCI write combining | Date | Sat, 25 Feb 2006 05:43:21 +0100 |
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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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