alpha: use asm-generic/scatterlist.h

Signed-off-by: FUJITA Tomonori <[e-mail]>
Acked-by: Matt Turner <[e-mail]>
Cc: Richard Henderson <[e-mail]>
Cc: Ivan Kokshaysky <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/alpha/Kconfig

···
 config NEED_DMA_MAP_STATE
        def_bool y
 
+config NEED_SG_DMA_LENGTH
+	def_bool y
+
 config GENERIC_ISA_DMA
 	bool
 	default y

arch/alpha/include/asm/scatterlist.h

···
 #ifndef _ALPHA_SCATTERLIST_H
 #define _ALPHA_SCATTERLIST_H
 
-#include <asm/page.h>
-#include <asm/types.h>
-  
-struct scatterlist {
-#ifdef CONFIG_DEBUG_SG
-	unsigned long sg_magic;
-#endif
-	unsigned long page_link;
-	unsigned int offset;
-
-	unsigned int length;
-
-	dma_addr_t dma_address;
-	__u32 dma_length;
-};
-
-#define sg_dma_address(sg)	((sg)->dma_address)
-#define sg_dma_len(sg)		((sg)->dma_length)
-
 #define ISA_DMA_THRESHOLD (~0UL)
+
+#include <asm-generic/scatterlist.h>
+
+#undef ARCH_HAS_SG_CHAIN
 
 #endif /* !(_ALPHA_SCATTERLIST_H) */