Messages in this thread | | | Date | Thu, 09 Sep 2010 10:10:00 -0700 | From | David Daney <> | Subject | Re: [PATCH 3/3] MIPS: DMA: Add plat_extra_sync_for_cpu() |
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On 09/08/2010 04:02 PM, Kevin Cernekee wrote: > On noncoherent processors with a readahead cache, an extra platform- > specific invalidation is required during the dma_sync_*_for_cpu() > operations to keep drivers from seeing stale prefetched data. > > Signed-off-by: Kevin Cernekee<cernekee@gmail.com> > --- > .../include/asm/mach-cavium-octeon/dma-coherence.h | 13 +++++++++++++ > arch/mips/include/asm/mach-generic/dma-coherence.h | 13 +++++++++++++ > arch/mips/include/asm/mach-ip27/dma-coherence.h | 13 +++++++++++++ > arch/mips/include/asm/mach-ip32/dma-coherence.h | 13 +++++++++++++ > arch/mips/include/asm/mach-jazz/dma-coherence.h | 13 +++++++++++++ > .../mips/include/asm/mach-loongson/dma-coherence.h | 13 +++++++++++++ > arch/mips/include/asm/mach-powertv/dma-coherence.h | 13 +++++++++++++ > arch/mips/mm/dma-default.c | 3 +++ > 8 files changed, 94 insertions(+), 0 deletions(-) > [...]
But as far as I can see, none of your plat_extra_sync_for_cpu() do anything.
Perhaps adding this hook should be deferred until there is actually a user.
David Daney
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