linux-kernel - [tip:x86/asm] x86: Remove unused thread_return label from switch

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Date:	Sun, 8 Nov 2009 11:06:41 GMT
From:	tip-bot for Masami Hiramatsu <mhiramat@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	dle-develop@...ts.sourceforge.net, tglx@...utronix.de,
	mhiramat@...hat.com, systemtap@...rces.redhat.com, mingo@...e.hu
Subject: [tip:x86/asm] x86: Remove unused thread_return label from switch_to()

Commit-ID:  c12a229bc5971534537a7d0e49e44f9f1f5d0336
Gitweb:     http://git.kernel.org/tip/c12a229bc5971534537a7d0e49e44f9f1f5d0336
Author:     Masami Hiramatsu <mhiramat@...hat.com>
AuthorDate: Thu, 5 Nov 2009 11:03:59 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 8 Nov 2009 11:57:13 +0100

x86: Remove unused thread_return label from switch_to()

Remove unused thread_return label from switch_to() macro on
x86-64. Since this symbol cuts into schedule(), backtrace at the
latter half of schedule() was always shown as thread_return().

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: systemtap <systemtap@...rces.redhat.com>
Cc: DLE <dle-develop@...ts.sourceforge.net>
LKML-Reference: <20091105160359.5181.26225.stgit@...usame>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/include/asm/system.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h
index f08f973..1a953e2 100644
--- a/arch/x86/include/asm/system.h
+++ b/arch/x86/include/asm/system.h
@@ -128,8 +128,6 @@ do {									\
 	     "movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */	  \
 	     "movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */	  \
 	     "call __switch_to\n\t"					  \
-	     ".globl thread_return\n"					  \
-	     "thread_return:\n\t"					  \
 	     "movq "__percpu_arg([current_task])",%%rsi\n\t"		  \
 	     __switch_canary						  \
 	     "movq %P[thread_info](%%rsi),%%r8\n\t"			  \
--
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