[PATCH v3 2/2] riscv: memcpy: check src and dst before copy

Add src and dst address checking, if they are the same address, just return and don't copy data anymore.

Signed-off-by: Rick Chen rick@andestech.com --- Changes in v3 - new patch: separate from [1/2] --- arch/riscv/lib/memcpy.S | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/lib/memcpy.S b/arch/riscv/lib/memcpy.S index 00672c19ad..9884077c93 100644 --- a/arch/riscv/lib/memcpy.S +++ b/arch/riscv/lib/memcpy.S @@ -9,6 +9,7 @@ /* void *memcpy(void *, const void *, size_t) */ ENTRY(__memcpy) WEAK(memcpy) + beq a0, a1, .copy_end /* Save for return value */ mv t6, a0

@@ -121,6 +122,7 @@ WEAK(memcpy) 2:

mv a0, t6 +.copy_end: ret

.Lmisaligned_word_copy: