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author | Christoph Hellwig <hch@lst.de> | 2019-08-06 14:12:37 +0300 |
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committer | Christoph Hellwig <hch@lst.de> | 2019-09-04 11:13:18 +0200 |
commit | 5128da323514d1e4260a26f8284c26bc09f97f40 (patch) | |
tree | 1ba917cc0875f2aba48809d3264f5926941bc11e /drivers/parisc/sba_iommu.c | |
parent | 07d841a625bc5faee167adc296d04cbca7779703 (diff) | |
download | linux-5128da323514d1e4260a26f8284c26bc09f97f40.tar.gz |
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 'drivers/parisc/sba_iommu.c')
-rw-r--r-- | drivers/parisc/sba_iommu.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c index fa4df65b7e28..ed50502cc65a 100644 --- a/drivers/parisc/sba_iommu.c +++ b/drivers/parisc/sba_iommu.c @@ -1084,7 +1084,6 @@ static const struct dma_map_ops sba_ops = { .unmap_page = sba_unmap_page, .map_sg = sba_map_sg, .unmap_sg = sba_unmap_sg, - .mmap = dma_common_mmap, .get_sgtable = dma_common_get_sgtable, }; |