From f825c736e75b11adb59ec52a4a1096efddd2ec97 Mon Sep 17 00:00:00 2001 From: Aneesh Kumar K.V Date: Tue, 2 Jul 2013 11:15:15 +0530 Subject: 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 Acked-by: Paul Mackerras Signed-off-by: Aneesh Kumar K.V [removed defconfig changes] Signed-off-by: Marek Szyprowski --- mm/Kconfig | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'mm/Kconfig') 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. -- cgit v1.2.3-55-g7522