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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2013-07-02 11:15:15 +0530
committerMarek Szyprowski <m.szyprowski@samsung.com>2013-07-02 10:08:22 +0200
commitf825c736e75b11adb59ec52a4a1096efddd2ec97 (patch)
tree0592b3e3cf216341da2daa072874be0fc7d284d9 /mm
parent8bb495e3f02401ee6f76d1b1d77f3ac9f079e376 (diff)
mm/cma: Move dma contiguous changes into a seperate config
We want to use CMA for allocating hash page table and real mode area for PPC64. Hence move DMA contiguous related changes into a seperate config so that ppc64 can enable CMA without requiring DMA contiguous. Acked-by: Michal Nazarewicz <mina86@mina86.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> [removed defconfig changes] Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig24
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index e742d06285b7..26a5f815cfc3 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -477,3 +477,27 @@ config FRONTSWAP
and swap data is stored as normal on the matching swap device.
If unsure, say Y to enable frontswap.
+
+config CMA
+ bool "Contiguous Memory Allocator"
+ depends on HAVE_MEMBLOCK
+ select MIGRATION
+ select MEMORY_ISOLATION
+ help
+ This enables the Contiguous Memory Allocator which allows other
+ subsystems to allocate big physically-contiguous blocks of memory.
+ CMA reserves a region of memory and allows only movable pages to
+ be allocated from it. This way, the kernel can use the memory for
+ pagecache and when a subsystem requests for contiguous area, the
+ allocated pages are migrated away to serve the contiguous request.
+
+ If unsure, say "n".
+
+config CMA_DEBUG
+ bool "CMA debug messages (DEVELOPMENT)"
+ depends on DEBUG_KERNEL && CMA
+ help
+ Turns on debug messages in CMA. This produces KERN_DEBUG
+ messages for every CMA call as well as various messages while
+ processing calls such as dma_alloc_from_contiguous().
+ This option does not affect warning and error messages.