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Date: Fri, 1 Nov 2002 16:22:22 +0100
From: Andi Kleen <ak@suse.de>
To: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Cc: Arjan van de Ven <arjanv@redhat.com>, Andi Kleen <ak@suse.de>,
       linux-kernel@vger.kernel.org
Subject: Re: Need help with FPU/MMX/SSE state save/restore
Message-ID: <20021101162222.A15011@wotan.suse.de>
References: <200211011433.gA1EXBp20882@Port.imtp.ilyichevsk.odessa.ua>
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> Does it have anything to do with the fact I'm
> using this code from csum_partial[_copy_generic] ?

You cannot use kernel_fpu_begin in interrupt context,
and the csum copy functions can be called from that in some 
cases (e.g. TCP retransmit timer). You need to check for 
in_interrupt() too.

I think the problem in your case is that you don't save/restore
your registers properly around the function call. C calling
conventions allow to clobber some of them and you don't seem
to handle that.

-Andi
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