Re: [PATCH][RFC] asm-generic:remove calling flush_write_buffers()in dma_sync_*_for_cpu

[Russell King - ARM Linux]

On Tue, Jul 07, 2009 at 09:54:20AM +0800, Ming Lei wrote:
> 2009/6/30 Arnd Bergmann <arnd@xxxxxxxx>:
> > On Tuesday 30 June 2009, Alan Cox wrote:
> > Well, not even that. dma-mapping-common.h only makes sense on architectures
> > that have multiple dma-mapping implementations (parisc, mips, arm, powerpc,
> 
> It seems that there is only one dma-mmaping implementation on ARM, doesn't it?
> Is it necessary that using dma-mapping-common.h on ARM?

ARM has two (normal, and dma bounce), and in the long run we need to do
cache handling on unmap as well as map due to CPU speculative fetches.
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