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Date: Sat, 2 Jul 2011 18:29:43 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: Ingo Molnar <mingo@...e.hu> Cc: LKML <linux-kernel@...r.kernel.org>, Frederic Weisbecker <fweisbec@...il.com>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Arnaldo Carvalho de Melo <acme@...hat.com>, Jan Beulich <JBeulich@...ell.com> Subject: [PATCH 5/6] 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@...il.com> Cc: Ingo Molnar <mingo@...e.hu> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: H. Peter Anvin <hpa@...or.com> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Arnaldo Carvalho de Melo <acme@...hat.com> Cc: Jan Beulich <JBeulich@...ell.com> --- arch/x86/kernel/entry_64.S | 1 - 1 files changed, 0 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 20dc8e6..6131432 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: */ -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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