x86: verify_cpu: use XOR for CPUID.EAX=0
PATCH 2/3 x86: verify_cpu: use XOR for CPUID.EAX=0
MOV eax, imm32 is 5 bytes. XOR eax, eax is 2 bytes.
Signed-off-by Alexey Dobriyan <[email protected]>
---
arch/x86/kernel/verify_cpu.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
arch/x86/kernel/verify_cpu.S +1 -1
@@ -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