Commit 48ffee7d authored Jul 02, 2011 by Frederic Weisbecker

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>

parent 3b99a3ef

arch/x86/kernel/entry_64.S

+0 −1

Original line number	Original line	Diff line number	Diff line
	@@ -327,7 +327,6 @@ ENDPROC(native_usergs_sysret64)
	jne 2f		jne 2f
	mov PER_CPU_VAR(irq_stack_ptr),%rsp		mov PER_CPU_VAR(irq_stack_ptr),%rsp
	EMPTY_FRAME 0		EMPTY_FRAME 0
	pushq_cfi %rbp /* backlink for unwinder */
	/*		/*
	* We entered an interrupt context - irqs are off:		* We entered an interrupt context - irqs are off:
	*/		*/