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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 /drivers/parisc/ccio-dma.c | |
| parent | 07d841a625bc5faee167adc296d04cbca7779703 (diff) | |
| download | lwn-5128da323514d1e4260a26f8284c26bc09f97f40.tar.gz lwn-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 'drivers/parisc/ccio-dma.c')
| -rw-r--r-- | drivers/parisc/ccio-dma.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c index 1d7125d29bee..ad290f79983b 100644 --- a/drivers/parisc/ccio-dma.c +++ b/drivers/parisc/ccio-dma.c @@ -1024,7 +1024,6 @@ static const struct dma_map_ops ccio_ops = { .unmap_page = ccio_unmap_page, .map_sg = ccio_map_sg, .unmap_sg = ccio_unmap_sg, - .mmap = dma_common_mmap, .get_sgtable = dma_common_get_sgtable, }; |