linux-kernel - [tip:x86/asm] x86/entry/64: Make gs

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Message-ID: <tip-42c748bb2544f21c3d115240527fe4478e193641@git.kernel.org>
Date:	Wed, 13 Apr 2016 04:31:02 -0700
From:	tip-bot for Borislav Petkov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, tglx@...utronix.de, dvlasenk@...hat.com,
	r.marek@...embler.cz, luto@...nel.org, bp@...en8.de,
	mingo@...nel.org, bp@...e.de, brgerst@...il.com,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	linux-kernel@...r.kernel.org, luto@...capital.net
Subject: [tip:x86/asm] x86/entry/64: Make gs_change a local label

Commit-ID:  42c748bb2544f21c3d115240527fe4478e193641
Gitweb:     http://git.kernel.org/tip/42c748bb2544f21c3d115240527fe4478e193641
Author:     Borislav Petkov <bp@...e.de>
AuthorDate: Thu, 7 Apr 2016 17:31:50 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 13 Apr 2016 10:20:42 +0200

x86/entry/64: Make gs_change a local label

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

Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rudolf Marek <r.marek@...embler.cz>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/b9c532a0e5f8d56dede2bd59767d40024d5a75e2.1460075211.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/entry/entry_64.S | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 64d2033..1693c17 100644
--- 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