[PATCH 3/4] xtensa: fix errors with dma_supported

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

commit eec17ba9f049 ("dma-mapping: consolidate dma_supported") has
removed dma_supported() from individual arch files to
asm-generic/dma-mapping-common.h or if arch has its own implementation
then we need to set the flag HAVE_ARCH_DMA_SUPPORTED. Otherwise we were
getting error like:
error: redefinition of 'dma_supported'
while building with allmodconfig.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---
 arch/xtensa/include/asm/dma-mapping.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h
index 5762d8d..019a94a 100644
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h
@@ -30,10 +30,7 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 		return &xtensa_dma_map_ops;
 }
 
-#include <asm-generic/dma-mapping-common.h>
-
-#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
-#define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
+#define HAVE_ARCH_DMA_SUPPORTED 1
 
 static inline int
 dma_supported(struct device *dev, u64 mask)
@@ -41,6 +38,11 @@ dma_supported(struct device *dev, u64 mask)
 	return 1;
 }
 
+#include <asm-generic/dma-mapping-common.h>
+
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
+#define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
+
 static inline int
 dma_set_mask(struct device *dev, u64 mask)
 {
-- 
1.9.1