1 files changed, 3 insertions, 0 deletions

diff --git a/arch/ia64/lib/memcpy_mck.S b/arch/ia64/lib/memcpy_mck.S
index 6f308e62c137..46c9331e7ab5 100644
--- a/arch/ia64/lib/memcpy_mck.S
+++ b/arch/ia64/lib/memcpy_mck.S
@@ -625,8 +625,11 @@ EK(.ex_handler,  (p17)	st8	[dst1]=r39,8);						\
         clrrrb
         ;;
         alloc   saved_pfs_stack=ar.pfs,3,3,3,0
+        cmp.lt  p8,p0=A,r0
         sub     B = dst0, saved_in0     // how many byte copied so far
         ;;
+(p8)    mov     A = 0;                  // A shouldn't be negative, cap it
+        ;;
         sub     C = A, B
         sub     D = saved_in2, A
         ;;