From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752791AbaCKG2f (ORCPT ); Tue, 11 Mar 2014 02:28:35 -0400 Received: from mga02.intel.com ([134.134.136.20]:12924 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751041AbaCKG2e (ORCPT ); Tue, 11 Mar 2014 02:28:34 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,629,1389772800"; d="scan'208";a="470004508" From: Andi Kleen To: Andy Lutomirski Cc: "H. Peter Anvin" , Linus Torvalds , x86@kernel.org, Stefani Seibold , Andreas Brief , Martin Runge , Linux Kernel Mailing List Subject: Re: [PATCH] x86: Remove compat vdso support References: <775280bd6cab6345a1d340e7038d2011763bf81b.1394492341.git.luto@amacapital.net> Date: Mon, 10 Mar 2014 23:28:33 -0700 In-Reply-To: <775280bd6cab6345a1d340e7038d2011763bf81b.1394492341.git.luto@amacapital.net> (Andy Lutomirski's message of "Mon, 10 Mar 2014 17:12:31 -0700") Message-ID: <878ushgsfi.fsf@tassilo.jf.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andy Lutomirski writes: > The compat vDSO is a complicated hack that's needed to maintain > compatibility with a small range of never-released glibc versions. > > This removes it and replaces it with a much simpler hack: a config > option to disable the 32-bit vDSO by default. Nack! That breaks at least one SUSE version. And I don't want to break performance completely there either. int 0x80 is just too slow. -Andi -- ak@linux.intel.com -- Speaking for myself only