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x86: Remove useless unwinder backlink from irq regs saving

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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>
This commit is contained in:
Frederic Weisbecker 2011-07-02 15:03:44 +02:00
parent 3b99a3ef55
commit 48ffee7d9e
1 changed files with 0 additions and 1 deletions
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1
arch/x86/kernel/entry_64.S
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@ -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:
*/