[PATCH 1/1] ARM:r0 is also corrupted after calling __do_div64.

[Chen Gang]

R0 is corrupted after calling __do_div64 and compiler is not informed
about this in macro __do_div_asm. If n is to be used again after this
macro, r0 is not reloaded and n will contain incorrect value

Signed-off-by: Chen Gang <gangchen at rdamicro.com>
---
 arch/arm/include/asm/div64.h | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/arm/include/asm/div64.h b/arch/arm/include/asm/div64.h
index a66061a..4829618 100644
--- a/arch/arm/include/asm/div64.h
+++ b/arch/arm/include/asm/div64.h
@@ -34,13 +34,15 @@
 	register unsigned long long __n   asm("r0") = n;	\
 	register unsigned long long __res asm("r2");		\
 	register unsigned int __rem       asm(__xh);		\
+	register unsigned int __clobber   asm(__xl);		\
 	asm(	__asmeq("%0", __xh)				\
-		__asmeq("%1", "r2")				\
-		__asmeq("%2", "r0")				\
-		__asmeq("%3", "r4")				\
+		__asmeq("%1", __xl)				\
+		__asmeq("%2", "r2")				\
+		__asmeq("%3", "r0")				\
+		__asmeq("%4", "r4")				\
 		"bl	__do_div64"				\
-		: "=r" (__rem), "=r" (__res)			\
-		: "r" (__n), "r" (__base)			\
+		: "=r"(__rem), "=r"(__clobber), "=r"(__res)	\
+		: "r"(__n), "r"(__base)				\
 		: "ip", "lr", "cc");				\
 	n = __res;						\
 	__rem;							\
-- 
1.9.1