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Subject: Re: SMP in 2.4
To: mikulas@artax.karlin.mff.cuni.cz (Mikulas Patocka)
Date: Sat, 21 Apr 2001 10:50:23 +0100 (BST)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), dennis@etinc.com (Dennis),
        matti.aarnio@zmailer.org (Matti Aarnio), linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.3.96.1010421110704.25023A-100000@artax.karlin.mff.cuni.cz> from "Mikulas Patocka" at Apr 21, 2001 11:08:31 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> > especially if you want to do it right on the BX. But you can do this and rtlinux
> > does
> 
> There is already desc->handler->ack(irq) in do_IRQ which does that. Is any
> more special handling needed? 

You need to keep the IRQ line masked not just ack it. The code for handling all
the BX and other cases is there but its a bit more than 3 clock cycles long


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