x86/boot: Hide local labels in verify_cpu()

... from the final ELF image's symbol table as they're not
really needed there.

Before:

$ readelf -a vmlinux | grep verify_cpu
    43: ffffffff810001a9     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu
    45: ffffffff8100028f     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_no_longmode
    46: ffffffff810001de     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_noamd
    47: ffffffff8100022b     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_check
    48: ffffffff8100021c     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_clear_xd
    49: ffffffff81000263     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_sse_test
    50: ffffffff81000296     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_sse_ok

After:

$ readelf -a vmlinux | grep verify_cpu
    43: ffffffff810001a9     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1451860733-21163-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 25 insertions, 25 deletions

diff --git a/arch/x86/kernel/verify_cpu.S b/arch/x86/kernel/verify_cpu.S
index 4cf401f581e7..07efb35ee4bc 100644
--- a/arch/x86/kernel/verify_cpu.S
+++ b/arch/x86/kernel/verify_cpu.S
@@ -48,31 +48,31 @@ verify_cpu:
         pushfl
         popl    %eax
         cmpl    %eax,%ebx
-        jz      verify_cpu_no_longmode  # cpu has no cpuid
+        jz      .Lverify_cpu_no_longmode        # cpu has no cpuid
 #endif
 
         movl    $0x0,%eax               # See if cpuid 1 is implemented
         cpuid
         cmpl    $0x1,%eax
-        jb      verify_cpu_no_longmode  # no cpuid 1
+        jb      .Lverify_cpu_no_longmode        # no cpuid 1
 
         xor     %di,%di
         cmpl    $0x68747541,%ebx        # AuthenticAMD
-        jnz     verify_cpu_noamd
+        jnz     .Lverify_cpu_noamd
         cmpl    $0x69746e65,%edx
-        jnz     verify_cpu_noamd
+        jnz     .Lverify_cpu_noamd
         cmpl    $0x444d4163,%ecx
-        jnz     verify_cpu_noamd
+        jnz     .Lverify_cpu_noamd
         mov     $1,%di                  # cpu is from AMD
-        jmp     verify_cpu_check
+        jmp     .Lverify_cpu_check
 
-verify_cpu_noamd:
+.Lverify_cpu_noamd:
         cmpl    $0x756e6547,%ebx        # GenuineIntel?
-        jnz     verify_cpu_check
+        jnz     .Lverify_cpu_check
         cmpl    $0x49656e69,%edx
-        jnz     verify_cpu_check
+        jnz     .Lverify_cpu_check
         cmpl    $0x6c65746e,%ecx
-        jnz     verify_cpu_check
+        jnz     .Lverify_cpu_check
 
         # only call IA32_MISC_ENABLE when:
         # family > 6 || (family == 6 && model >= 0xd)
@@ -83,59 +83,59 @@ verify_cpu_noamd:
         andl    $0x0ff00f00, %eax       # mask family and extended family
         shrl    $8, %eax
         cmpl    $6, %eax
-        ja      verify_cpu_clear_xd     # family > 6, ok
-        jb      verify_cpu_check        # family < 6, skip
+        ja      .Lverify_cpu_clear_xd   # family > 6, ok
+        jb      .Lverify_cpu_check      # family < 6, skip
 
         andl    $0x000f00f0, %ecx       # mask model and extended model
         shrl    $4, %ecx
         cmpl    $0xd, %ecx
-        jb      verify_cpu_check        # family == 6, model < 0xd, skip
+        jb      .Lverify_cpu_check      # family == 6, model < 0xd, skip
 
-verify_cpu_clear_xd:
+.Lverify_cpu_clear_xd:
         movl    $MSR_IA32_MISC_ENABLE, %ecx
         rdmsr
         btrl    $2, %edx                # clear MSR_IA32_MISC_ENABLE_XD_DISABLE
-        jnc     verify_cpu_check        # only write MSR if bit was changed
+        jnc     .Lverify_cpu_check      # only write MSR if bit was changed
         wrmsr
 
-verify_cpu_check:
+.Lverify_cpu_check:
         movl    $0x1,%eax               # Does the cpu have what it takes
         cpuid
         andl    $REQUIRED_MASK0,%edx
         xorl    $REQUIRED_MASK0,%edx
-        jnz     verify_cpu_no_longmode
+        jnz     .Lverify_cpu_no_longmode
 
         movl    $0x80000000,%eax        # See if extended cpuid is implemented
         cpuid
         cmpl    $0x80000001,%eax
-        jb      verify_cpu_no_longmode  # no extended cpuid
+        jb      .Lverify_cpu_no_longmode        # no extended cpuid
 
         movl    $0x80000001,%eax        # Does the cpu have what it takes
         cpuid
         andl    $REQUIRED_MASK1,%edx
         xorl    $REQUIRED_MASK1,%edx
-        jnz     verify_cpu_no_longmode
+        jnz     .Lverify_cpu_no_longmode
 
-verify_cpu_sse_test:
+.Lverify_cpu_sse_test:
         movl    $1,%eax
         cpuid
         andl    $SSE_MASK,%edx
         cmpl    $SSE_MASK,%edx
-        je      verify_cpu_sse_ok
+        je      .Lverify_cpu_sse_ok
         test    %di,%di
-        jz      verify_cpu_no_longmode  # only try to force SSE on AMD
+        jz      .Lverify_cpu_no_longmode        # only try to force SSE on AMD
         movl    $MSR_K7_HWCR,%ecx
         rdmsr
         btr     $15,%eax                # enable SSE
         wrmsr
         xor     %di,%di                 # don't loop
-        jmp     verify_cpu_sse_test     # try again
+        jmp     .Lverify_cpu_sse_test   # try again
 
-verify_cpu_no_longmode:
+.Lverify_cpu_no_longmode:
         popf                            # Restore caller passed flags
         movl $1,%eax
         ret
-verify_cpu_sse_ok:
+.Lverify_cpu_sse_ok:
         popf                            # Restore caller passed flags
         xorl %eax, %eax
         ret