From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755031AbdKBMx2 (ORCPT ); Thu, 2 Nov 2017 08:53:28 -0400 Received: from terminus.zytor.com ([65.50.211.136]:37403 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752139AbdKBMxZ (ORCPT ); Thu, 2 Nov 2017 08:53:25 -0400 Date: Thu, 2 Nov 2017 05:48:47 -0700 From: tip-bot for Borislav Petkov Message-ID: Cc: mingo@kernel.org, torvalds@linux-foundation.org, luto@kernel.org, tglx@linutronix.de, hpa@zytor.com, peterz@infradead.org, brgerst@gmail.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, bp@suse.de Reply-To: dave.hansen@intel.com, linux-kernel@vger.kernel.org, bp@suse.de, torvalds@linux-foundation.org, mingo@kernel.org, luto@kernel.org, tglx@linutronix.de, hpa@zytor.com, brgerst@gmail.com, peterz@infradead.org In-Reply-To: <20171102120926.4srwerqrr7g72e2k@pd.tnic> References: <20171102120926.4srwerqrr7g72e2k@pd.tnic> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/asm] x86/entry/64: Shorten TEST instructions Git-Commit-ID: 1e4c4f610f774df6088d7c065b2dd4d22adba698 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 1e4c4f610f774df6088d7c065b2dd4d22adba698 Gitweb: https://git.kernel.org/tip/1e4c4f610f774df6088d7c065b2dd4d22adba698 Author: Borislav Petkov AuthorDate: Thu, 2 Nov 2017 13:09:26 +0100 Committer: Ingo Molnar CommitDate: Thu, 2 Nov 2017 13:45:37 +0100 x86/entry/64: Shorten TEST instructions Convert TESTL to TESTB and save 3 bytes per callsite. No functionality change. Signed-off-by: Borislav Petkov Cc: Andy Lutomirski Cc: Brian Gerst Cc: Dave Hansen Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20171102120926.4srwerqrr7g72e2k@pd.tnic Signed-off-by: Ingo Molnar --- arch/x86/entry/entry_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 40e9933..84263c7 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -620,7 +620,7 @@ GLOBAL(retint_user) GLOBAL(swapgs_restore_regs_and_return_to_usermode) #ifdef CONFIG_DEBUG_ENTRY /* Assert that pt_regs indicates user mode. */ - testl $3, CS(%rsp) + testb $3, CS(%rsp) jnz 1f ud2 1: @@ -653,7 +653,7 @@ retint_kernel: GLOBAL(restore_regs_and_return_to_kernel) #ifdef CONFIG_DEBUG_ENTRY /* Assert that pt_regs indicates kernel mode. */ - testl $3, CS(%rsp) + testb $3, CS(%rsp) jz 1f ud2 1: