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authorChristoph Hellwig <hch@lst.de>2020-06-10 10:29:49 +0200
committerChristoph Hellwig <hch@lst.de>2020-06-17 09:29:31 +0200
commit1fbf57d0530217b9f264eedc4867bf91479cdf3c (patch)
tree24d8dfeea45accda549aa7cfba9cbcabe5f9c684 /kernel/dma/Kconfig
parentdbed452a078d56bc7f1abecc3edd6a75e8e4484e (diff)
dma-direct: re-enable mmap for !CONFIG_MMU
nommu configfs can trivially map the coherent allocations to user space, as no actual page table setup is required and the kernel and the user space programs share the same address space. Fixes: 62fcee9a3bd7 ("dma-mapping: remove CONFIG_ARCH_NO_COHERENT_DMA_MMAP") Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: dillon min <dillon.minfei@gmail.com> Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com> Tested-by: dillon min <dillon.minfei@gmail.com>
Diffstat (limited to 'kernel/dma/Kconfig')
-rw-r--r--kernel/dma/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index a0ce3c1494fd..14ef8e1bdefe 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -71,6 +71,7 @@ config SWIOTLB
# in the pagetables
#
config DMA_NONCOHERENT_MMAP
+ default y if !MMU
bool
config DMA_COHERENT_POOL