From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: manfred@colorfullife.com (Manfred Spraul)
Cc: linux-kernel@vger.kernel.org,
arjan@fenrus.demon.nl (Arjan van de Ven),
dledford@redhat.com (Doug Ledford),
torvalds@transmeta.com (Linus Torvalds)
Subject: Re: [RFC] framework for fpu usage in kernel
Date: Sun, 11 Feb 2001 20:26:44 +0000 (GMT) [thread overview]
Message-ID: <E14S359-0004vi-00@the-village.bc.nu> (raw)
In-Reply-To: <3A86E21D.9AB66964@colorfullife.com> from "Manfred Spraul" at Feb 11, 2001 08:03:57 PM
> memcopy is a really generic function, and calling it saves the current
> fpu state into thread.i387.f{,x}save. IMHO that's wrong, memcopy must
> save into a local buffer like raid5 checksumming.
The mmx copy is only done in task context. There are a whole variety
of _horrible_ problems doing it in interrupt space so based on the
considerable number of problems with prior attempts to get it right on
IRQ and copyuser cases I didnt bother
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next prev parent reply other threads:[~2001-02-11 20:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-11 19:03 Manfred Spraul
2001-02-11 20:26 ` Alan Cox [this message]
2001-02-11 20:30 ` Manfred Spraul
2001-02-11 20:37 ` Alan Cox
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