arm: lib: memcpy: Do not copy to same address

In some cases (e.g. bootm with a elf payload which is already at the right
position) there is a in place copy of data to the same address. Catching this
saves some ms while booting.

Signed-off-by: Matthias Weisser <weisserm@arcor.de>

diff --git a/arch/arm/lib/memcpy.S b/arch/arm/lib/memcpy.S
index 3b5aeec4cf5b373e35fa9db0918a28e7e3db3d6d..f655256b5d1514f949b880c322cb225a73cd538b 100644 (file)
--- a/arch/arm/lib/memcpy.S
+++ b/arch/arm/lib/memcpy.S
@@ -60,6 +60,9 @@
 .globl memcpy
 memcpy:
 
+               cmp     r0, r1
+               moveq   pc, lr
+
                enter   r4, lr
 
                subs    r2, r2, #4