There are verions of DEF_MMIO_IN_X and DEF_MMIO_OUT_X in asm/io.h
that contain a workaround for a limitation in gcc <=4.0, but the
minimum supported version of gcc is now 4.6, so these can be safely
removed.
Signed-off-by: Darren Stevens <dar...@stevens-zone.net>
---
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index e0331e7..4433477 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -108,25 +108,6 @@
#define IO_SET_SYNC_FLAG()
#endif
-/* gcc 4.0 and older doesn't have 'Z' constraint */
-#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ == 0)
-#define DEF_MMIO_IN_X(name, size, insn) \
-static inline u##size name(const volatile u##size __iomem *addr) \
-{ \
- u##size ret; \
- __asm__ __volatile__("sync;"#insn" %0,0,%1;twi 0,%0,0;isync" \
- : "=r" (ret) : "r" (addr), "m" (*addr) : "memory"); \
- return ret; \
-}
-
-#define DEF_MMIO_OUT_X(name, size, insn) \
-static inline void name(volatile u##size __iomem *addr, u##size val) \
-{ \
- __asm__ __volatile__("sync;"#insn" %1,0,%2" \
- : "=m" (*addr) : "r" (val), "r" (addr) : "memory"); \
- IO_SET_SYNC_FLAG(); \
-}
-#else /* newer gcc */
#define DEF_MMIO_IN_X(name, size, insn) \
static inline u##size name(const volatile u##size __iomem *addr) \
{ \
@@ -143,7 +124,6 @@ static inline void name(volatile u##size __iomem *addr,
u##size val) \
: "=Z" (*addr) : "r" (val) : "memory"); \
IO_SET_SYNC_FLAG(); \
}
-#endif
#define DEF_MMIO_IN_D(name, size, insn) \
static inline u##size name(const volatile u##size __iomem *addr) \
