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dma-coherent: Add NO_DMA dummies for managed DMA API

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Add dummies for dmam_{alloc,free}_coherent(), to allow compile-testing
if NO_DMA=y.

This prevents the following from showing up later:

    ERROR: "dmam_alloc_coherent" [drivers/net/ethernet/arc/arc_emac.ko] undefined!
    ERROR: "dmam_free_coherent" [drivers/net/ethernet/apm/xgene/xgene-enet.ko] undefined!
    ERROR: "dmam_alloc_coherent" [drivers/net/ethernet/apm/xgene/xgene-enet.ko] undefined!
    ERROR: "dmam_alloc_coherent" [drivers/mtd/nand/hisi504_nand.ko] undefined!
    ERROR: "dmam_alloc_coherent" [drivers/mmc/host/dw_mmc.ko] undefined!

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Geert Uytterhoeven 2018-03-16 14:25:41 +01:00 committed by Christoph Hellwig
parent f29ab49b53
commit ab642e952f
1 changed files with 9 additions and 0 deletions
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9
include/linux/dma-mapping.h
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@ -776,10 +776,19 @@ 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);