From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754872Ab1GBQaF (ORCPT ); Sat, 2 Jul 2011 12:30:05 -0400 Received: from mail-wy0-f174.google.com ([74.125.82.174]:39758 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754817Ab1GBQaA (ORCPT ); Sat, 2 Jul 2011 12:30:00 -0400 From: Frederic Weisbecker To: Ingo Molnar Cc: LKML , Frederic Weisbecker , Thomas Gleixner , "H. Peter Anvin" , Peter Zijlstra , Arnaldo Carvalho de Melo , Jan Beulich Subject: [PATCH 5/6] x86: Remove useless unwinder backlink from irq regs saving Date: Sat, 2 Jul 2011 18:29:43 +0200 Message-Id: <1309624184-9790-6-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1309624184-9790-1-git-send-email-fweisbec@gmail.com> References: <1309624184-9790-1-git-send-email-fweisbec@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Cc: Ingo Molnar Cc: Thomas Gleixner Cc: H. Peter Anvin Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: Jan Beulich --- 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