| Date | Tue, 1 Sep 2020 15:53:04 +0200 | From | Thomas Bogendoerfer <> | Subject | Re: [PATCH 08/28] MIPS: make dma_sync_*_for_cpu a little less overzealous |
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On Wed, Aug 19, 2020 at 08:55:35AM +0200, Christoph Hellwig wrote: > When transferring DMA ownership back to the CPU there should never > be any writeback from the cache, as the buffer was owned by the > device until now. Instead it should just be invalidated for the > mapping directions where the device could have written data. > Note that the changes rely on the fact that kmap_atomic is stubbed > out for the !HIGHMEM case to simplify the code a bit. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > arch/mips/mm/dma-noncoherent.c | 44 +++++++++++++++++++++------------- > 1 file changed, 28 insertions(+), 16 deletions(-)
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
-- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
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