Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752035AbbHRH5w (ORCPT ); Tue, 18 Aug 2015 03:57:52 -0400 Received: from mail-wi0-f175.google.com ([209.85.212.175]:33211 "EHLO mail-wi0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751353AbbHRH5l (ORCPT ); Tue, 18 Aug 2015 03:57:41 -0400 Date: Tue, 18 Aug 2015 09:57:37 +0200 From: Ingo Molnar To: Linus Torvalds Cc: Denys Vlasenko , Juergen Gross , Andy Lutomirski , Linux Kernel Mailing List , Thomas Gleixner , "H. Peter Anvin" , Peter Zijlstra , Brian Gerst , Andrew Morton Subject: Re: [GIT PULL] x86 fixes Message-ID: <20150818075737.GC32338@gmail.com> References: <20150814071500.GA2678@gmail.com> <20150817080143.GA16928@gmail.com> <55D1BE89.1030108@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1626 Lines: 40 * Linus Torvalds wrote: > On Mon, Aug 17, 2015 at 3:59 AM, Denys Vlasenko wrote: > > > > I have it running linux 2.6.20 and busybox here: > > > > http://busybox.net/live_bbox/live_bbox.html > > > > (or rather, *you* will have it running linux 2.6.20 inside your browser, > > after you click on that link) > > Heh. I'm not sure that's a very useful thing, but if somebody can make a kvm > image or something with an old distribution that is known to work with FPU > emulation, maybe we should verify that the current code at least works. > > Because even if we decide that just deleting it is the right thing for long-term > maintainability, it would be better if we delete it in a state where it is known > to work about as well as it ever did. So that *if* we have to resurrect it, we > know that it at least was working at the point where it was deleted. > > I hate deleting code because it got broken. In contrast, I don't mind deleting > code that no longer makes sense to maintain. The two are supposed to be very > different things. Absolutely agreed - it was my other motivator to try to fix math-emu in the FPU series. Another example is the low level assembly code which we are converting to C code, we (tried to) fix and deobfuscate and fix it before moving to C for similar reasons. Thanks, Ingo -- 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/