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authorArnd Bergmann <arnd@arndb.de>2016-05-12 10:38:31 +0200
committerKrzysztof Kozlowski <k.kozlowski@samsung.com>2016-05-18 16:55:16 +0200
commit4cb54493ab2003568222e6ad7449747354f22ce3 (patch)
tree5ef9d5b033972e89589c821ccba69d66c72a127c /Documentation
parent2dcd0af568b0cf583645c8a317dd12e344b1c72a (diff)
ARM: samsung: improve static dma_mask definition
When no DMA master devices are part of the kernel configuration, we get a warning about the unused dma mask definition: arch/arm/plat-samsung/devs.c:71:12: error: 'samsung_device_dma_mask' defined but not used [-Werror=unused-variable] static u64 samsung_device_dma_mask = DMA_BIT_MASK(32); We could simply mark this as __maybe_unused to shut up that warning, but a nicer solution seems to be to have a separate mask for each device. The advantage is that a driver that happens to call dma_set_mask() on one device doesn't implicitly change the mask for the other devices as well. This is more of a theoretical problem, as obviously nothing does it for the devices in this file (or they would have always been broken), but it feels cleaner that way. The definition works by creating an array in place so we can take the address of it and let the compiler generate a hidden symbol for it at compile time. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
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