From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753474AbbDBOgd (ORCPT ); Thu, 2 Apr 2015 10:36:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52352 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752514AbbDBOgb (ORCPT ); Thu, 2 Apr 2015 10:36:31 -0400 From: Denys Vlasenko To: Ingo Molnar Cc: Denys Vlasenko , Linus Torvalds , Steven Rostedt , Borislav Petkov , "H. Peter Anvin" , Andy Lutomirski , Oleg Nesterov , Frederic Weisbecker , Alexei Starovoitov , Will Drewry , Kees Cook , x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/9] x86/asm/entry/64: optimize [v]fork/clone stubs Date: Thu, 2 Apr 2015 16:36:11 +0200 Message-Id: <1427985378-4287-2-git-send-email-dvlasenk@redhat.com> In-Reply-To: <1427985378-4287-1-git-send-email-dvlasenk@redhat.com> References: <1427985378-4287-1-git-send-email-dvlasenk@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Replace "call func; ret" with "jmp func". Run-tested. Signed-off-by: Denys Vlasenko CC: Linus Torvalds CC: Steven Rostedt CC: Ingo Molnar CC: Borislav Petkov CC: "H. Peter Anvin" CC: Andy Lutomirski CC: Oleg Nesterov CC: Frederic Weisbecker CC: Alexei Starovoitov CC: Will Drewry CC: Kees Cook CC: x86@kernel.org CC: linux-kernel@vger.kernel.org --- arch/x86/kernel/entry_64.S | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 765436c..ec51598 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -407,8 +407,7 @@ ENTRY(stub_\func) CFI_STARTPROC DEFAULT_FRAME 0, 8 /* offset 8: return address */ SAVE_EXTRA_REGS 8 - call sys_\func - ret + jmp sys_\func CFI_ENDPROC END(stub_\func) .endm -- 1.8.1.4