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CONFIG_DMA_CMA: DMA Contiguous Memory Allocator

General informations

The Linux kernel configuration item CONFIG_DMA_CMA has multiple definitions:

DMA Contiguous Memory Allocator found in kernel/dma/Kconfig

The configuration item CONFIG_DMA_CMA:

Help text

This enables the Contiguous Memory Allocator which allows drivers 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".

DMA Contiguous Memory Allocator found in drivers/base/Kconfig

The configuration item CONFIG_DMA_CMA:

Help text

This enables the Contiguous Memory Allocator which allows drivers 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".

Hardware

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