Commit 5128da32 authored by Christoph Hellwig's avatar Christoph Hellwig

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: default avatarChristoph Hellwig <hch@lst.de>
parent 07d841a6
...@@ -52,7 +52,6 @@ config PARISC ...@@ -52,7 +52,6 @@ config PARISC
select GENERIC_SCHED_CLOCK select GENERIC_SCHED_CLOCK
select HAVE_UNSTABLE_SCHED_CLOCK if SMP select HAVE_UNSTABLE_SCHED_CLOCK if SMP
select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS
select ARCH_NO_COHERENT_DMA_MMAP
select CPU_NO_EFFICIENT_FFS select CPU_NO_EFFICIENT_FFS
select NEED_DMA_MAP_STATE select NEED_DMA_MAP_STATE
select NEED_SG_DMA_LENGTH select NEED_SG_DMA_LENGTH
......
...@@ -1024,7 +1024,6 @@ static const struct dma_map_ops ccio_ops = { ...@@ -1024,7 +1024,6 @@ static const struct dma_map_ops ccio_ops = {
.unmap_page = ccio_unmap_page, .unmap_page = ccio_unmap_page,
.map_sg = ccio_map_sg, .map_sg = ccio_map_sg,
.unmap_sg = ccio_unmap_sg, .unmap_sg = ccio_unmap_sg,
.mmap = dma_common_mmap,
.get_sgtable = dma_common_get_sgtable, .get_sgtable = dma_common_get_sgtable,
}; };
......
...@@ -1084,7 +1084,6 @@ static const struct dma_map_ops sba_ops = { ...@@ -1084,7 +1084,6 @@ static const struct dma_map_ops sba_ops = {
.unmap_page = sba_unmap_page, .unmap_page = sba_unmap_page,
.map_sg = sba_map_sg, .map_sg = sba_map_sg,
.unmap_sg = sba_unmap_sg, .unmap_sg = sba_unmap_sg,
.mmap = dma_common_mmap,
.get_sgtable = dma_common_get_sgtable, .get_sgtable = dma_common_get_sgtable,
}; };
......
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