From 48ffee7d9e6df51b4957bed64115b7beed671374 Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Sat, 2 Jul 2011 15:03:44 +0200
Subject: [PATCH] x86: Remove useless unwinder backlink from irq regs saving

The unwinder backlink in interrupt entry is very useless.
It's actually not part of the stack frame chain and thus is
never used.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jan Beulich <JBeulich@novell.com>
---
 arch/x86/kernel/entry_64.S | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 20dc8e6b6d80..6131432c5afa 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -327,7 +327,6 @@ ENDPROC(native_usergs_sysret64)
 	jne 2f
 	mov PER_CPU_VAR(irq_stack_ptr),%rsp
 	EMPTY_FRAME 0
-	pushq_cfi %rbp			/* backlink for unwinder */
 	/*
 	 * We entered an interrupt context - irqs are off:
 	 */
-- 
2.20.1