arm64: optimize __asm_{flush, invalidate}_dcache_all

__asm_dcache_all can directly return to the caller of
__asm_{flush,invalidate}_dcache_all.

We do not have to waste x16 register here.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: York Sun <york.sun@nxp.com>

diff --git a/arch/arm/cpu/armv8/cache.S b/arch/arm/cpu/armv8/cache.S
index a9f4fec387feccf2262ef3eef58efe8d838c1d78..1c71a2f616da815e3e27021ff233d01b36580926 100644 (file)
--- a/arch/arm/cpu/armv8/cache.S
+++ b/arch/arm/cpu/armv8/cache.S
@@ -104,19 +104,13 @@ finished:
 ENDPROC(__asm_dcache_all)
 
 ENTRY(__asm_flush_dcache_all)
-       mov     x16, lr
        mov     x0, #0
-       bl      __asm_dcache_all
-       mov     lr, x16
-       ret
+       b       __asm_dcache_all
 ENDPROC(__asm_flush_dcache_all)
 
 ENTRY(__asm_invalidate_dcache_all)
-       mov     x16, lr
        mov     x0, #0x1
-       bl      __asm_dcache_all
-       mov     lr, x16
-       ret
+       b       __asm_dcache_all
 ENDPROC(__asm_invalidate_dcache_all)
 
 /*