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Re: preempt safe fpu-emulator

To: "Kevin D. Kissell" <KevinK@mips.com>
Subject: Re: preempt safe fpu-emulator
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 28 Apr 2005 16:21:23 +0100
Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp>, linux-mips@linux-mips.org
In-reply-to: <002d01c54bfa$5b913f80$0deca8c0@Ulysses>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20050427.143622.77402407.nemoto@toshiba-tops.co.jp> <20050428134118.GC1276@linux-mips.org> <002d01c54bfa$5b913f80$0deca8c0@Ulysses>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.4.1i
On Thu, Apr 28, 2005 at 06:58:28AM -0700, Kevin D. Kissell wrote:

> When I first integrated the Algorithmics emulator with the Linux kernel
> several years back, I tried doing something like this but ran into some
> problem that I cannot recall exactly - there may have been some case
> where the system expected threads to "inherit" FCSR changes.  I agree
> that this is an obviously cleaner approach, but be careful.

The global variables definately won't fly anymore in preemptable and SMP
kernels.  Or rather any attempt to get that to work would only make things
worse, so they had to go.

  Ralf

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