Commit c9b19ea6 authored by Marek Szyprowski's avatar Marek Szyprowski
Browse files

dma-mapping: avoid potential unused data compilation warning 



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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Suggested-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Tested-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250415075659.428549-1-m.szyprowski@samsung.com
parent 2042c352

include/linux/dma-mapping.h

+8 −4
Original line number Diff line number Diff line
@@ -629,10 +629,14 @@ 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 */