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| author | Christoph Hellwig <hch@lst.de> | 2019-08-06 14:12:37 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-09-04 11:13:18 +0200 |
| commit | 5128da323514d1e4260a26f8284c26bc09f97f40 (patch) | |
| tree | 1ba917cc0875f2aba48809d3264f5926941bc11e /arch | |
| parent | 07d841a625bc5faee167adc296d04cbca7779703 (diff) | |
| download | blackbird-op-linux-5128da323514d1e4260a26f8284c26bc09f97f40.tar.gz blackbird-op-linux-5128da323514d1e4260a26f8284c26bc09f97f40.zip | |
parisc: don't set ARCH_NO_COHERENT_DMA_MMAP
parisc is the only architecture that sets ARCH_NO_COHERENT_DMA_MMAP
when an MMU is enabled. AFAIK this is because parisc CPUs use VIVT
caches, which means exporting normally cachable memory to userspace is
relatively dangrous due to cache aliasing.
But normally cachable memory is only allocated by dma_alloc_coherent
on parisc when using the sba_iommu or ccio_iommu drivers, so just
remove the .mmap implementation for them so that we don't have to set
ARCH_NO_COHERENT_DMA_MMAP, which I plan to get rid of.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/Kconfig | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index 6d732e451071..e9dd88b7f81e 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -52,7 +52,6 @@ config PARISC select GENERIC_SCHED_CLOCK select HAVE_UNSTABLE_SCHED_CLOCK if SMP select GENERIC_CLOCKEVENTS - select ARCH_NO_COHERENT_DMA_MMAP select CPU_NO_EFFICIENT_FFS select NEED_DMA_MAP_STATE select NEED_SG_DMA_LENGTH |
