x86: simplify ljmp to 32-bit code

You can directly specify the label as the operand for ljmp.

This commit saves 4-byte code.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: fixed the gas warning]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/cpu/start16.S b/arch/x86/cpu/start16.S
index bcabd76..54f4ff6 100644 (file)
--- a/arch/x86/cpu/start16.S
+++ b/arch/x86/cpu/start16.S
@@ -44,10 +44,8 @@ data32 cs    lgdt    gdt_ptr
 ff:
 
        /* Finally restore BIST and jump to the 32-bit initialization code */
-       movw    $code32start, %ax
-       movw    %ax, %bp
        movl    %ecx, %eax
-data32 cs      ljmp    *(%bp)
+data32 cs      ljmp    *code32start
 
        /* 48-bit far pointer */
 code32start: