linux-kernel - Re: [GIT PULL] x86 fixes

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Message-ID: <CA+55aFw4pjStVG6zqqS7VCeWvqH+mKcGV_CwqqyRbB1NGcZqug@mail.gmail.com>
Date:	Mon, 17 Aug 2015 09:47:01 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Juergen Gross <jgross@...e.com>, Andy Lutomirski <luto@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Brian Gerst <brgerst@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86 fixes

On Mon, Aug 17, 2015 at 1:01 AM, Ingo Molnar <mingo@...nel.org> 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
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