Date: Wed, 15 Sep 2004 22:00:19 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Lee Revell <rlrevell@joe-job.com>, Andrea Arcangeli <andrea@novell.com>,
       Chris Wedgwood <cw@f00f.org>, Arjan van de Ven <arjanv@redhat.com>,
       Hugh Dickins <hugh@veritas.com>, "Martin J. Bligh" <mbligh@aracnet.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       LKML <linux-kernel@vger.kernel.org>,
       Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option
Message-ID: <20040915200018.GA17773@elte.hu>
References: <20040913061641.GA11276@elte.hu> <41489B7A.6010407@tmr.com>
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* Bill Davidsen <davidsen@tmr.com> wrote:

> Okay, I'll be the one to ask... what overload of the IPL acronym are
> you using here? I asked google and several jargon files, and they all
> say that IPL (initial program load) is IBMspeak for cold boot. Somehow
> I don't think that's what you mean here.

i understood it as Interrupt Privilege Levels. The notion of having some
sort of scalar 'limit' - all interrupts with a higher priority than that
will execute, all interrupts with lower priority will block.  This is a
fundamentally dodgy concept because in reality interrupt sources are
independent entities so the natural description for of them is a bitmask
(or an array, or whatever), not a level.

	Ingo
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