Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933601AbbGUTBp (ORCPT ); Tue, 21 Jul 2015 15:01:45 -0400 Received: from outbound.smtp.vt.edu ([198.82.183.121]:43889 "EHLO omr2.cc.vt.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755770AbbGUTBo (ORCPT ); Tue, 21 Jul 2015 15:01:44 -0400 X-Mailer: exmh version 2.8.0 04/21/2012 with nmh-1.6+dev To: Andy Lutomirski Cc: Jason Baron , Borislav Petkov , Peter Zijlstra , Thomas Gleixner , Mikulas Patocka , Paul Mackerras , Arnaldo Carvalho de Melo , Kees Cook , Andrea Arcangeli , Vince Weaver , "hillf.zj" , "linux-kernel@vger.kernel.org" , Steven Rostedt Subject: Re: Kernel broken on processors without performance counters In-Reply-To: Your message of "Tue, 21 Jul 2015 11:54:30 -0700." From: Valdis.Kletnieks@vt.edu References: <20150708160750.GQ19282@twins.programming.kicks-ass.net> <559D8250.8000707@gmail.com> <20150710141359.GJ19282@twins.programming.kicks-ass.net> <20150721082107.GE18673@twins.programming.kicks-ass.net> <20150721154959.GS19282@twins.programming.kicks-ass.net> <20150721161215.GU19282@twins.programming.kicks-ass.net> <20150721181553.GA3378@nazgul.tnic> <55AE9471.1000601@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1437505205_2287P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Tue, 21 Jul 2015 15:00:05 -0400 Message-ID: <5808.1437505205@turing-police.cc.vt.edu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1702 Lines: 43 --==_Exmh_1437505205_2287P Content-Type: text/plain; charset=us-ascii On Tue, 21 Jul 2015 11:54:30 -0700, Andy Lutomirski said: > Could this be done at link time, or perhaps when compressing the > kernel image, instead of at boot time? That's only safe to do if the kernel is built for one specific CPU - if it's a generic kernel that boots on multiple hardware designs, it will be wrong for some systems. In other words - safe to do if you're building it for *your* hardware. Totally unsafe for a distro. --==_Exmh_1437505205_2287P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Exmh version 2.5 07/13/2001 iQIVAwUBVa6WtQdmEQWDXROgAQI/bA/+JZjOLDTHZyxJL38fReP+xtHWdaVeNn6E pNr0A7jVZYVW6IKGLYUv7gnSILVFFyon2eaEr0QRg1+9HdLhQWJDurz9Vv5CuEbv 63A/FqrGF5pv2vw2ZQR2L9rz/A7rLFbBk8uk5VIGH+XqzUGq+jiQNTu+/j24bbgM GwNBfJMgBiYXCPoX7R5wVSro6fHtbtWtzazPJNMcBWrdL/11W1zlFW+OmawysYx8 KWTBeIS+uxKNqKT7n/c8uOLq8FgN22oBruC78T196BsJguGtZDXZJnjAtQGYhFDB 9k5hDBQPbWB4grK/eOeL8CcNlPmVPRPooofKIdCRWaGM1Q1D7VhZ+28nPJzCUj92 As8Ox90KJFfqU/3xDHwox3k/jGtDKtld1+Ib68ukQr8qXwskZrC2i2RGlzenIX/q wwIALkO5KnS8BBO5sxV72829p/iwniY8Lxna+u0AvL5+2X9lDaCrFIeSg3Q05op9 C8hTzGfGGyhBFzAKK+n7yKWlab6lBm7PMBFH9z15uOFTgfQzLjrPZSXGAvyZcwYK wR1kSVVh9XQUs0cj4Lic3NUnOBEA4l6TYbN2piKG9LsmhIWjeA9NQ0xz9jGs37yF KZAD7txhGlZJkICQoUJFFdZm4NHOpEyVwIrG9HAe+ljK0aOBPqa/AlQOqJOZyzJx NKzclYq6M94= =2Nvv -----END PGP SIGNATURE----- --==_Exmh_1437505205_2287P-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/