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driver core: lift dma_default_coherent into common code

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Lift the dma_default_coherent variable from the mips architecture code
to the driver core.  This allows an architecture to sdefault all device
to be DMA coherent at run time, even if the kernel is build with support
for DMA noncoherent device.  By allowing device_initialize to set the
->dma_coherent field to this default the amount of arch hooks required
for this behavior can be greatly reduced.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Christoph Hellwig
2021-02-10 10:56:39 +01:00
committed by Thomas Bogendoerfer
parent 14ac09a65e
commit 6d4e9a8efe
13 changed files with 14 additions and 39 deletions
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3
kernel/dma/Kconfig
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@@ -33,9 +33,6 @@ config NEED_DMA_MAP_STATE
config ARCH_DMA_ADDR_T_64BIT
def_bool 64BIT || PHYS_ADDR_T_64BIT
config ARCH_HAS_DMA_COHERENCE_H
bool
config ARCH_HAS_DMA_SET_MASK
bool