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authorJean Delvare <jdelvare@suse.de>2014-10-10 00:29:41 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-10 04:26:02 +0200
commitf0d6d1f6ff6f8525cfa396ec1969b8f402391445 (patch)
tree281f528aa811d13960ae1d8cd117be432639abc6 /drivers/base/Kconfig
parentfs/buffer.c: increase the buffer-head per-CPU LRU size (diff)
downloadlinux-f0d6d1f6ff6f8525cfa396ec1969b8f402391445.tar.xz
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CMA: document cma=0
It isn't obvious that CMA can be disabled on the kernel's command line, so document it. Signed-off-by: Jean Delvare <jdelvare@suse.de> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Chuck Ebbert <cebbert.lkml@gmail.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--drivers/base/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 134f763d90fd..61a33f4ba608 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -252,6 +252,9 @@ config DMA_CMA
to allocate big physically-contiguous blocks of memory for use with
hardware components that do not support I/O map nor scatter-gather.
+ You can disable CMA by specifying "cma=0" on the kernel's command
+ line.
+
For more information see <include/linux/dma-contiguous.h>.
If unsure, say "n".