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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>
This commit is contained in:
Paul Cercueil 2020-09-30 12:28:21 +02:00 committed by Christoph Hellwig
parent c51a9868d3
commit 0de327969b
1 changed files with 1 additions and 1 deletions
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2
kernel/dma/Kconfig
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@ -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