The patch titled
Subject: CMA: document cma=0
has been added to the -mm tree. Its filename is
cma-document-cma=0.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/cma-document-cma=0.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/cma-document-cma=0.patch
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------------------------------------------------------
From: Jean Delvare <jdelvare@xxxxxxx>
Subject: 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@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Chuck Ebbert <cebbert.lkml@xxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 3 ++-
drivers/base/Kconfig | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff -puN Documentation/kernel-parameters.txt~cma-document-cma=0 Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~cma-document-cma=0
+++ a/Documentation/kernel-parameters.txt
@@ -656,7 +656,8 @@ bytes respectively. Such letter suffixes
Sets the size of kernel global memory area for
contiguous memory allocations and optionally the
placement constraint by the physical address range of
- memory allocations. For more information, see
+ memory allocations. A value of 0 disables CMA
+ altogether. For more information, see
include/linux/dma-contiguous.h
cmo_free_hint= [PPC] Format: { yes | no }
diff -puN drivers/base/Kconfig~cma-document-cma=0 drivers/base/Kconfig
--- a/drivers/base/Kconfig~cma-document-cma=0
+++ a/drivers/base/Kconfig
@@ -231,6 +231,9 @@ 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".
_
Patches currently in -mm which might be from jdelvare@xxxxxxx are
cma-document-cma=0.patch
linux-next.patch
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