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dma-mapping: make support for dma ops optional

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Avoid the overhead of the dma ops support for tiny builds that only
use the direct mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
Christoph Hellwig
2020-07-08 09:30:00 +02:00
parent b417417300
commit 2f9237d4f6
19 changed files with 43 additions and 6 deletions
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4
kernel/dma/Kconfig
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@@ -5,6 +5,9 @@ config HAS_DMA
depends on !NO_DMA
default y
config DMA_OPS
bool
config NEED_SG_DMA_LENGTH
bool
@@ -60,6 +63,7 @@ config DMA_NONCOHERENT_CACHE_SYNC
config DMA_VIRT_OPS
bool
depends on HAS_DMA
select DMA_OPS
config SWIOTLB
bool

3
kernel/dma/Makefile
View File

@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_HAS_DMA) += mapping.o direct.o dummy.o
obj-$(CONFIG_HAS_DMA) += mapping.o direct.o
obj-$(CONFIG_DMA_OPS) += dummy.o
obj-$(CONFIG_DMA_CMA) += contiguous.o
obj-$(CONFIG_DMA_DECLARE_COHERENT) += coherent.o
obj-$(CONFIG_DMA_VIRT_OPS) += virt.o