Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f0d6d1f6 authored by Jean Delvare's avatar Jean Delvare Committed by Linus Torvalds
Browse files

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: default avatarJean 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 86cf78d7

Documentation/kernel-parameters.txt

+2 −1
Original line number Diff line number Diff line
@@ -656,7 +656,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
			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 }

drivers/base/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -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".