[PATCH/RFC,2/6] dma-coherent: Add NO_DMA dummies for managed DMA API
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: 2018-02-06 10:16:14
Also in:
linux-arch, linux-iommu, linux-scsi, lkml
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
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>
---
include/linux/dma-mapping.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index d78d7541f784875b..4d92956a4ddb8a5c 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);