x86/entry/64: Make gs_change a local label

... so that it doesn't appear in objdump output.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rudolf Marek <r.marek@assembler.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/b9c532a0e5f8d56dede2bd59767d40024d5a75e2.1460075211.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 64d2033d1e49d5bc3d65c05d83d86c6a339ddec1..1693c17dbf81477547b4189e79e61ba7267acfab 100644 (file)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -781,7 +781,7 @@ ENTRY(native_load_gs_index)
        pushfq
        DISABLE_INTERRUPTS(CLBR_ANY & ~CLBR_RDI)
        SWAPGS
-gs_change:
+.Lgs_change:
        movl    %edi, %gs
 2:     ALTERNATIVE "", "mfence", X86_BUG_SWAPGS_FENCE
        SWAPGS
@@ -789,7 +789,7 @@ gs_change:
        ret
 END(native_load_gs_index)
 
-       _ASM_EXTABLE(gs_change, bad_gs)
+       _ASM_EXTABLE(.Lgs_change, bad_gs)
        .section .fixup, "ax"
        /* running with kernelgs */
 bad_gs:
@@ -1019,13 +1019,13 @@ ENTRY(error_entry)
        movl    %ecx, %eax                      /* zero extend */
        cmpq    %rax, RIP+8(%rsp)
        je      .Lbstep_iret
-       cmpq    $gs_change, RIP+8(%rsp)
+       cmpq    $.Lgs_change, RIP+8(%rsp)
        jne     .Lerror_entry_done
 
        /*
-        * hack: gs_change can fail with user gsbase.  If this happens, fix up
+        * hack: .Lgs_change can fail with user gsbase.  If this happens, fix up
         * gsbase and proceed.  We'll fix up the exception and land in
-        * gs_change's error handler with kernel gsbase.
+        * .Lgs_change's error handler with kernel gsbase.
         */
        jmp     .Lerror_entry_from_usermode_swapgs