This is an incomplete proof of concept that I applied to be able to
build a 64 bit kernel with GCC-4.4.  It doesn't handle the 32 bit case
or the R4000_WAR case.

Comments welcome.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
---
 arch/mips/include/asm/compiler.h |    7 +++++++
 2 files changed, 11 insertions(+), 0 deletions(-)

--- a/arch/mips/include/asm/compiler.h
+++ b/arch/mips/include/asm/compiler.h
@@ -16,4 +16,11 @@
 #define GCC_REG_ACCUM "accum"
 #endif
 
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
+#define GCC_NO_H_CONSTRAINT
+#ifdef CONFIG_64BIT
+typedef unsigned int uint128_t __attribute__((mode(TI)));
+#endif
+#endif
+
 #endif /* _ASM_COMPILER_H */
