asm-generic: remove ARCH_HAS_SG_CHAIN in scatterlist.h

There are more architectures that don't support ARCH_HAS_SG_CHAIN than
those that support it.  This removes removes ARCH_HAS_SG_CHAIN in
asm-generic/scatterlist.h and lets arhictectures to define it.

It's clearer than defining ARCH_HAS_SG_CHAIN asm-generic/scatterlist.h and
undefing it in arhictectures that don't support it.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/ia64/include/asm/scatterlist.h b/arch/ia64/include/asm/scatterlist.h
index d8e98961dec7..f299a4fb25c8 100644
--- a/arch/ia64/include/asm/scatterlist.h
+++ b/arch/ia64/include/asm/scatterlist.h
@@ -1,6 +1,7 @@
 #ifndef _ASM_IA64_SCATTERLIST_H
 #define _ASM_IA64_SCATTERLIST_H
 
+#include <asm-generic/scatterlist.h>
 /*
  * It used to be that ISA_DMA_THRESHOLD had something to do with the
  * DMA-limits of ISA-devices.  Nowadays, its only remaining use (apart
@@ -10,7 +11,6 @@
  * that's 4GB - 1.
  */
 #define ISA_DMA_THRESHOLD       0xffffffff
-
-#include <asm-generic/scatterlist.h>
+#define ARCH_HAS_SG_CHAIN
 
 #endif /* _ASM_IA64_SCATTERLIST_H */