Hi Marek, [sorry for copying, forget to CC the list]
On Sat, Jun 16, 2012 at 2:29 AM, Marek Vasut <marek.va...@gmail.com> wrote: > Hm, can't we just punch a hole in the MMU table at runtime instead of > preallocating it like this? > It's allocated at runtime now, do you mean allocate it on demand? Good point, Probably we can malloc big enough block and make it uncached directly from dma_alloc_coherent(). Is it what you suggest? Also, what is this for? Can we not simply flush/invalidate the caches? > flush/invalidate can be racy for some hardware. Sometimes we need to write some field to DMA descriptor and then read another one. And because one cannot flush/invalidate individual bytes write/flush can destroy the field updated by hardware. (Well, we can invalidate/read before write/flush but that introduces a race). Regards, Ilya.
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