diff options
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index eb9eab4ecd6d..f8ab1c0f589e 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -212,14 +212,14 @@ static inline void set_dma_ops(struct device *dev, } #else /* - * Define the dma api to allow compilation but not linking of - * dma dependent code. Code that depends on the dma-mapping - * API needs to set 'depends on HAS_DMA' in its Kconfig + * Define the dma api to allow compilation of dma dependent code. + * Code that depends on the dma-mapping API needs to set 'depends on HAS_DMA' + * in its Kconfig, unless it already depends on <something> || COMPILE_TEST, + * where <something> guarantuees the availability of the dma-mapping API. */ -extern const struct dma_map_ops bad_dma_ops; static inline const struct dma_map_ops *get_dma_ops(struct device *dev) { - return &bad_dma_ops; + return NULL; } #endif @@ -518,12 +518,8 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size, if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) return cpu_addr; - /* - * Let the implementation decide on the zone to allocate from, and - * decide on the way of zeroing the memory given that the memory - * returned should always be zeroed. - */ - flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | __GFP_ZERO); + /* let the implementation decide on the zone to allocate from: */ + flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); if (!arch_dma_alloc_attrs(&dev, &flag)) return NULL; @@ -776,10 +772,19 @@ static inline void dma_deconfigure(struct device *dev) {} /* * Managed DMA API */ +#ifdef CONFIG_HAS_DMA extern void *dmam_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); +#else /* !CONFIG_HAS_DMA */ +static inline void *dmam_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp) +{ return NULL; } +static inline void dmam_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) { } +#endif /* !CONFIG_HAS_DMA */ + extern void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); |