linux-kernel - Re: [RFC 0/4] dynamically allocate arch specific system vectors

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Date:	Sun, 14 Sep 2008 17:48:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dean Nelson <dcn@....com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alan Mayer <ajm@....com>, jeremy@...p.org,
	rusty@...tcorp.com.au, suresh.b.siddha@...el.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <Yinghai.lu@....com>
Subject: Re: [RFC 0/4] dynamically allocate arch specific system vectors


* Ingo Molnar <mingo@...e.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
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