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Date: Sun, 14 Sep 2008 17:48:25 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Dean Nelson <dcn@sgi.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>, Alan Mayer <ajm@sgi.com>,
       jeremy@goop.org, rusty@rustcorp.com.au, suresh.b.siddha@intel.com,
       torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
       "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
       Yinghai Lu <Yinghai.lu@amd.com>
Subject: Re: [RFC 0/4] dynamically allocate arch specific system vectors
Message-ID: <20080914154825.GA13513@elte.hu>
References: <489C6844.9050902@sgi.com> <20080811165930.GI4524@elte.hu> <48A0737F.9010207@sgi.com> <m1y733mjdh.fsf@frodo.ebiederm.org> <20080911152304.GA13655@sgi.com> <20080914153522.GJ29290@elte.hu>
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* Ingo Molnar <mingo@elte.hu> wrote:

> > There are two kernel modules, sgi-gru and sgi-xp (in drivers/misc), 
> > that each need two vectors. And there's the broadcast assist unit 
> > (BAU) that is involved in tlb shootdown on uv, which currently uses 
> > statically reserved vector 0xf8 (UV_BAU_MESSAGE -- see 
> > uv_bau_init()).
> 
> while i understand the UV_BAU_MESSAGE case (TLB flushes are special), 
> why does sgi-gru and sgi-xp need to go that deep? They are drivers, 
> they should be able to make use of an ordinary irq just like the other 
> 2000 drivers we have do.

... but all in one, i still like this concept as it's a nice clean-up. I 
just dont think it should be exposed to generic drivers, and i think it 
needs further fixes and cleanups. (see my previous mails)

	Ingo