[PATCH 1/4] x86, putuser: add ASM_CALL_CONSTRAINT

[Alexey Dobriyan]

Clobber stack pointer given that assembly does CALL.

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

 arch/x86/include/asm/uaccess.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -176,7 +176,8 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
 })
 
 #define __put_user_x(size, x, ptr, __ret_pu)			\
-	asm volatile("call __put_user_" #size : "=a" (__ret_pu)	\
+	asm volatile("call __put_user_" #size			\
+		     : "=a" (__ret_pu), ASM_CALL_CONSTRAINT	\
 		     : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")