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To: john cooper <>
Subject: Re: PREEMPT
Date: Thu, 6 Oct 2005 13:45:55 -0500 (CDT)
Cc: Ralf Baechle <>, Greg Weeks <>,
In-reply-to: <>
Original-recipient: rfc822;
> The code base I'm dealing with is a 2.6.13 derivative
> with PREEMPT_RT support.  Looks like the problem was
> due to PREEMPT_RT confusing fpu_emulator_cop1Handler()
> resulting in a SIGBUS nailing the associated task.
> I have it sort of working for soft FPU but expect it
> requires some attention to safely access a HW FPU where
> emulation assistance is needed.
Um, did no one have a look at Atsushi Nemoto's patch earlier today
that addressed pre-emption and CPU1, or am I missing something?


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