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@xxxxxxxxx> --- .../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
