Re: USB mass storage and ARM cache coherency

From: Benjamin Herrenschmidt
Date: Wed Mar 03 2010 - 00:15:14 EST

On Wed, 2010-03-03 at 12:47 +0900, FUJITA Tomonori wrote:
> The ways to improve the approach (introducing PG_arch_2 or marking a
> page clean on dma_unmap_* with DMA_FROM_DEVICE like ia64 does) is up
> to architectures.

How does the above work ? IE, the dma unmap will flush the D side but
not the I side ... or is the ia64 flush primitive magic enough to do
both ?


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