From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755450AbbHQQrE (ORCPT ); Mon, 17 Aug 2015 12:47:04 -0400 Received: from mail-ig0-f179.google.com ([209.85.213.179]:36583 "EHLO mail-ig0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750799AbbHQQrB (ORCPT ); Mon, 17 Aug 2015 12:47:01 -0400 MIME-Version: 1.0 In-Reply-To: <20150817080143.GA16928@gmail.com> References: <20150814071500.GA2678@gmail.com> <20150817080143.GA16928@gmail.com> Date: Mon, 17 Aug 2015 09:47:01 -0700 X-Google-Sender-Auth: 14RpeQS8b0ZG2viurNkiZZSkoM8 Message-ID: Subject: Re: [GIT PULL] x86 fixes From: Linus Torvalds To: Ingo Molnar Cc: Juergen Gross , Andy Lutomirski , Linux Kernel Mailing List , Thomas Gleixner , "H. Peter Anvin" , Peter Zijlstra , Brian Gerst , Denys Vlasenko , Andrew Morton Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 17, 2015 at 1:01 AM, Ingo Molnar wrote: > > Any objections against removing all of math-emu in v4.3? This would simplify the > FPU code in various places beyond math-emu/. Hmm. I guess we could just try. The fact that you argue that the FP emulation likely hasn't worked for a few years is a pretty powerful argument that nobody has cared. And if somebody does, and ends up having a use case and willing to test, we can always re-animate the zombie that is math emu support. Considering that we don't support the old i386 any more, the only chip I know of that needs it is the i486sx. However, there are probably several clone chips that did the "we're a 486" thing by adding the few integer instructions but not doing a FPU. And there might well be various embedded versions of the 486 that might even be in use still. But afaik most distributions have required Pentium of P6-level capabilities for some time, and I guess any existing old systems aren't going to upgrade their kernels anyway. Linus