[PATCH 2/3] x86: verify_cpu: use XOR for CPUID.EAX=0
From: Alexey Dobriyan
Date: Thu May 17 2018 - 16:35:06 EST
MOV eax, imm32 is 5 bytes. XOR eax, eax is 2 bytes.
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---
arch/x86/kernel/verify_cpu.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/verify_cpu.S
+++ b/arch/x86/kernel/verify_cpu.S
@@ -51,7 +51,7 @@ ENTRY(verify_cpu)
jz .Lverify_cpu_no_longmode # cpu has no cpuid
#endif
- movl $0x0,%eax # See if cpuid 1 is implemented
+ xor %eax, %eax # See if cpuid 1 is implemented
cpuid
cmpl $0x1,%eax
jb .Lverify_cpu_no_longmode # no cpuid 1