summaryrefslogtreecommitdiff
path: root/include/linux/dma-mapping.h
diff options
context:
space:
mode:
authorGeert Uytterhoeven <geert@linux-m68k.org>2018-03-16 14:25:41 +0100
committerChristoph Hellwig <hch@lst.de>2018-03-16 19:58:27 +0100
commitab642e952f80c66c5592f0e2c35588843a813df8 (patch)
tree0ee8a756f466f2253f25b75db3a2fb1582cf6279 /include/linux/dma-mapping.h
parentf29ab49b5388b2f829cf99859bc5f8ad8ec4d06a (diff)
dma-coherent: Add NO_DMA dummies for managed DMA API
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>
Diffstat (limited to 'include/linux/dma-mapping.h')
-rw-r--r--include/linux/dma-mapping.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 5ea7eec83c0f..94f41846b933 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -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);