It isn't obvious that CMA can be disabled on the kernel's command
line, so document it.
Signed-off-by: Jean Delvare <jdelv...@suse.de>
Cc: Joonsoo Kim <iamjoonsoo....@lge.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
Documentation/kernel-parameters.txt | 3 ++-
drivers/base/Kconfig | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
--- linux-3.17-rc7.orig/Documentation/kernel-parameters.txt 2014-09-23
13:19:06.644838292 +0200
+++ linux-3.17-rc7/Documentation/kernel-parameters.txt 2014-10-04
14:10:03.257579721 +0200
@@ -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 }
--- linux-3.17-rc7.orig/drivers/base/Kconfig 2014-09-12 16:23:14.911353676
+0200
+++ linux-3.17-rc7/drivers/base/Kconfig 2014-10-04 13:41:37.672347240 +0200
@@ -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".
--
Jean Delvare
SUSE L3 Support
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