diff options
| author | Uros Bizjak <ubizjak@gmail.com> | 2020-10-29 17:02:58 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-11-21 10:26:25 +0100 |
| commit | ab09b58e4bdfdbcec425e54ebeaf6e209a96318f (patch) | |
| tree | 0b9c659eaf9edf23f0a0c90aa8cc829f97f97792 /arch/x86/boot/compressed/head_64.S | |
| parent | 61b39ad9a7d26fe14a2f5f23e5e940e7f9664d41 (diff) | |
x86/boot/compressed/64: Use TEST %reg,%reg instead of CMP $0,%reg
Use TEST %reg,%reg which sets the zero flag in the same way as CMP
$0,%reg, but the encoding uses one byte less.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20201029160258.139216-1-ubizjak@gmail.com
Diffstat (limited to 'arch/x86/boot/compressed/head_64.S')
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 017de6cc87dc..e94874f4bbc1 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -241,12 +241,12 @@ SYM_FUNC_START(startup_32) leal rva(startup_64)(%ebp), %eax #ifdef CONFIG_EFI_MIXED movl rva(efi32_boot_args)(%ebp), %edi - cmp $0, %edi + testl %edi, %edi jz 1f leal rva(efi64_stub_entry)(%ebp), %eax movl rva(efi32_boot_args+4)(%ebp), %esi movl rva(efi32_boot_args+8)(%ebp), %edx // saved bootparams pointer - cmpl $0, %edx + testl %edx, %edx jnz 1f /* * efi_pe_entry uses MS calling convention, which requires 32 bytes of @@ -592,7 +592,7 @@ SYM_CODE_START(trampoline_32bit_src) movl %eax, %cr0 /* Check what paging mode we want to be in after the trampoline */ - cmpl $0, %edx + testl %edx, %edx jz 1f /* We want 5-level paging: don't touch CR3 if it already points to 5-level page tables */ @@ -622,7 +622,7 @@ SYM_CODE_START(trampoline_32bit_src) /* Enable PAE and LA57 (if required) paging modes */ movl $X86_CR4_PAE, %eax - cmpl $0, %edx + testl %edx, %edx jz 1f orl $X86_CR4_LA57, %eax 1: |