From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 93E436B0269 for ; Thu, 15 Dec 2016 15:58:15 -0500 (EST) Received: by mail-pf0-f198.google.com with SMTP id 17so91447918pfy.2 for ; Thu, 15 Dec 2016 12:58:15 -0800 (PST) Received: from mail.zytor.com (torg.zytor.com. [2001:1868:205::12]) by mx.google.com with ESMTPS id q10si4070554pgf.264.2016.12.15.12.58.14 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Dec 2016 12:58:14 -0800 (PST) In-Reply-To: <20161215192017.GP8388@tassilo.jf.intel.com> References: <20161208162150.148763-1-kirill.shutemov@linux.intel.com> <20161208162150.148763-17-kirill.shutemov@linux.intel.com> <20161208200505.c6xiy56oufg6d24m@pd.tnic> <20161208202013.uutsny6avn5gimwq@pd.tnic> <20161215143944.ruxr6r3b2atg4tnf@pd.tnic> <20161215190902.tdle4uj27xkc3x4i@pd.tnic> <20161215192017.GP8388@tassilo.jf.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Subject: Re: [RFC, PATCHv1 15/28] x86: detect 5-level paging support From: hpa@zytor.com Date: Thu, 15 Dec 2016 12:57:43 -0800 Message-ID: <34A313BB-EB15-4A4C-AB77-BD678118F086@zytor.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andi Kleen , Borislav Petkov Cc: Linus Torvalds , "Kirill A. Shutemov" , Andrew Morton , the arch/x86 maintainers , Thomas Gleixner , Ingo Molnar , Arnd Bergmann , Dave Hansen , Andy Lutomirski , "linux-arch@vger.kernel.org" , linux-mm , Linux Kernel Mailing List On December 15, 2016 11:20:17 AM PST, Andi Kleen wrote: > >The code is not calling CPUID in any performance critical path, only >at initialization. So any discussion about saving a few instructions >is a complete waste of time. > >-Andi NB: the chief offender is Loadlin, which is still used in some manufacturing flows that depends on a mix of legacy DOS and Linux applications; however, older versions of LILO also have this problem. -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org