[PATCH] Document Linux's memory barriers [try #2]

David Howells dhowells at redhat.com
Thu Mar 9 06:31:42 EST 2006

Linus Torvalds <torvalds at osdl.org> wrote:

> Actually, since the different NUMA things may have different paths to the 
> PCI thing, I don't think even the mmiowb() will really help. It has 
> nothing to serialize _with_.

On NUMA PowerPC, should mmiowb() be a SYNC or an EIEIO instruction then? Those
do inter-component synchronisation.


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