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authorPaul Cercueil <paul@crapouillou.net>2020-09-30 12:28:21 +0200
committerChristoph Hellwig <hch@lst.de>2020-10-06 07:06:54 +0200
commit0de327969b61a245e3a47b60009eae73fe513cef (patch)
treed7a07a239b62415c483f29ceae4c0b68b9a43bd8 /kernel/dma/Kconfig
parentc51a9868d361a508c5340788950ece7959009c51 (diff)
cma: decrease CMA_ALIGNMENT lower limit to 2
On an embedded system with a tiny (1 MiB) CMA area for video memory, and a simple enough video pipeline, we can decrease the CMA_ALIGNMENT by a factor of 2 to avoid wasting memory, as all the allocations for video buffers will be of the exact same size (dictated by the size of the screen). Signed-off-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma/Kconfig')
-rw-r--r--kernel/dma/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index c5f717021f56..647996702bc9 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -177,7 +177,7 @@ endchoice
config CMA_ALIGNMENT
int "Maximum PAGE_SIZE order of alignment for contiguous buffers"
- range 4 12
+ range 2 12
default 8
help
DMA mapping framework by default aligns all buffers to the smallest