From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754202Ab1HQUhT (ORCPT ); Wed, 17 Aug 2011 16:37:19 -0400 Received: from hera.kernel.org ([140.211.167.34]:56750 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754173Ab1HQUhP (ORCPT ); Wed, 17 Aug 2011 16:37:15 -0400 Date: Wed, 17 Aug 2011 22:35:17 +0200 From: Ingo Molnar To: Andrew Lutomirski Cc: Andi Kleen , x86@kernel.org, "H. Peter Anvin" , linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, lueckintel@yahoo.com, kimwooyoung@gmail.com, Ingo Molnar , Borislav Petkov , Suresh Siddha Subject: Re: NACK! Re: [PATCH 4/4] Add vsyscalls to feature-removal-schedule.txt Message-ID: <20110817203517.GF16512@kernel.org> References: <066852f3f344c1733e0db9a2427981ea1815db7d.1312899174.git.luto@mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.6 (hera.kernel.org [127.0.0.1]); Wed, 17 Aug 2011 20:36:19 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Andrew Lutomirski wrote: > Somewhat to my surprise, fully up-to-date Fedora 15 seems to work > fine with vsyscall=none, and I wouldn't be terribly surprised if a > few of the distributions starting making it the default sooner or > later. I might do a followup patch to make the switch betweeen > vsyscall=emulate and vsyscall=none work as a sysctl. (Switching > from native to emulate at runtime could be problematic.) As long as no binaries break (emulation is fine) it's perfectly fine to phase out the executable vsyscall page and keep it as a data page only - and we can put that into feature-removal-schedule.txt just fine. Thanks, Ingo