From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755064Ab1HEUwZ (ORCPT ); Fri, 5 Aug 2011 16:52:25 -0400 Received: from one.firstfloor.org ([213.235.205.2]:42013 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751405Ab1HEUwW (ORCPT ); Fri, 5 Aug 2011 16:52:22 -0400 Date: Fri, 5 Aug 2011 22:52:22 +0200 From: Andi Kleen To: "H. Peter Anvin" Cc: Andrew Lutomirski , Andi Kleen , x86@kernel.org, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, lueckintel@yahoo.com, kimwooyoung@gmail.com Subject: Re: New vsyscall emulation breaks JITs Message-ID: <20110805205222.GK5782@one.firstfloor.org> References: <20110805200945.GA14014@tassilo.jf.intel.com> <4E3C5154.2050307@zytor.com> <4E3C571C.1070903@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4E3C571C.1070903@zytor.com> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 05, 2011 at 01:48:28PM -0700, H. Peter Anvin wrote: > On 08/05/2011 01:45 PM, Andrew Lutomirski wrote: > > > > hpa: time is supported (as of 3.0) by the vdso, and very new glibc > > uses the vdso version. We could add a native time implementation back > > to the vsyscall page without too much pain as a short-term fix, but > > that would be less than ideal. > > > > How new does glibc have to be? Mine from May 17 doesn't support it. > How much of a pain would it be to make the legacy vs emulated vsyscall > page a config option? CONFIG_DONT_BREAK_MY_BINARIES? If anything runtime, but really for me it looks like the vsyscall changes should be only in one of those limited compability paranoia patchkits. -Andi -- ak@linux.intel.com -- Speaking for myself only.