[PATCH] dma-mapping: fix build errors on !HAS_DMA architectures

[Heiko Carstens]

From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>

commit 4565f0170dfc849b3629c27d769db800467baa62 "dma-mapping: unify
dma_get_cache_alignment implementations" causes build errors on
!HAS_DMA architectures/platforms like s390 and sun3:

include/linux/dma-mapping.h:145: error: static declaration of 'dma_get_cache_alignment' follows non-static declaration
include/asm-generic/dma-mapping-broken.h:73: error: previous declaration of 'dma_get_cache_alignment' was here

Fix this by adding an explicit ifdef.

Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Acked-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---
 include/linux/dma-mapping.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -142,6 +142,7 @@ static inline int dma_set_seg_boundary(s
 		return -EIO;
 }
 
+#ifdef CONFIG_HAS_DMA
 static inline int dma_get_cache_alignment(void)
 {
 #ifdef ARCH_DMA_MINALIGN
@@ -149,6 +150,7 @@ static inline int dma_get_cache_alignmen
 #endif
 	return 1;
 }
+#endif
 
 /* flags for the coherent memory api */
 #define	DMA_MEMORY_MAP			0x01
--
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