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 <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]>
berg · Oct 6, 2020 · 0de3279 · 0de3279
1 parent c51a986
commit 0de3279
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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