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SubjectRe: [PATCH][RFC] asm-generic:remove calling flush_write_buffers() in dma_sync_*_for_cpu
> X86_OOSTORE is defined for (MWINCHIP3D || MWINCHIPC6) && MTRR. I am not sure if
> these chips have sfence.
> It would also help to know what OOSTORE exactly means in the context of that
> chip.

Non uncached stores may be visible out of order on the bus.

Alan


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