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dma-mapping: avoid potential unused data compilation warning

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[ Upstream commit c9b19ea63036fc537a69265acea1b18dabd1cbd3 ]

When CONFIG_NEED_DMA_MAP_STATE is not defined, dma-mapping clients might
report unused data compilation warnings for dma_unmap_*() calls
arguments. Redefine macros for those calls to let compiler to notice that
it is okay when the provided arguments are not used.

Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250415075659.428549-1-m.szyprowski@samsung.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marek Szyprowski
2025-04-15 09:56:59 +02:00
committed by Greg Kroah-Hartman
parent 2cab5ea2f5
commit c15dc980ff
1 changed files with 8 additions and 4 deletions
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12
include/linux/dma-mapping.h
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@@ -600,10 +600,14 @@ static inline int dma_mmap_wc(struct device *dev,
#else
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
#define dma_unmap_addr(PTR, ADDR_NAME) (0)
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
#define dma_unmap_len(PTR, LEN_NAME) (0)
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
#define dma_unmap_addr(PTR, ADDR_NAME) \
({ typeof(PTR) __p __maybe_unused = PTR; 0; })
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) \
do { typeof(PTR) __p __maybe_unused = PTR; } while (0)
#define dma_unmap_len(PTR, LEN_NAME) \
({ typeof(PTR) __p __maybe_unused = PTR; 0; })
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) \
do { typeof(PTR) __p __maybe_unused = PTR; } while (0)
#endif
#endif /* _LINUX_DMA_MAPPING_H */