linux-kernel - Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

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Message-Id: <200808091902.23725.wolfgang.walter@stwm.de>
Date:	Sat, 9 Aug 2008 19:02:23 +0200
From:	Wolfgang Walter <wolfgang.walter@...m.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"viro@...IV.linux.org.uk" <viro@...iv.linux.org.uk>,
	"vegard.nossum@...il.com" <vegard.nossum@...il.com>
Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

Am Samstag, 9. August 2008 18:10 schrieb H. Peter Anvin:
> Wolfgang Walter wrote:
> > How could any kernel code use MMX/SSE/FPU when the interrupt case isn't
> > handled?
>
> I don't think we have ever allowed MMX/SSE/FPU code in interrupt
> handlers.  kernel_fpu_begin()..end() lock out preemption, and so could
> only be interrupted, not preempted.

What about

arch/x86/lib/mmx_32.c

and then

include/asm-x86/string_32.h

couldn't memcpy end as beeing implemented with MMX? And interrupt handlers may 
use memcpy? Or did I miss something?

Similar: couldn't memcpy be called in asynchronous way, say a page fault or 
someting like that?

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
Leiter EDV
Leopoldstraße 15
80802 München
Tel: +49 89 38196 276
Fax: +49 89 38196 150
Email: wolfgang.walter@...m.de
http://www.studentenwerk-muenchen.de/
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