From: Paul Cercueil Date: Wed, 30 Sep 2020 10:28:21 +0000 (+0200) Subject: cma: decrease CMA_ALIGNMENT lower limit to 2 X-Git-Tag: io_uring-5.10-2020-10-20~45^2~13 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=0de327969b61a245e3a47b60009eae73fe513cef;p=linux-2.6-block.git 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 Signed-off-by: Christoph Hellwig --- 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