Merge remote-tracking branch 'dma-public/for-v3.12-cma-dma' into for-next

[firefly-linux-kernel-4.4.55.git] / mm / Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index 8028dcc6615c6bbd533adf060ea3d9db36b9a48c..256bfd0f6007dc3e40e6575318d120554d06a49e 100644 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -519,3 +519,27 @@ config MEM_SOFT_DIRTY
          it can be cleared by hands.
 
          See Documentation/vm/soft-dirty.txt for more details.
+
+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.