linux-kernel - Re: [RFC] killing the NR

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Message-Id: <200702170237.42910.arnd@arndb.de>
Date:	Sat, 17 Feb 2007 02:37:42 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Russell King <rmk+lkml@....linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC] killing the NR_IRQS arrays.

On Friday 16 February 2007 23:37, Benjamin Herrenschmidt wrote:
> You might want to have a look at the powerpc API with it's remaping
> capabilities. It's very nice for handling multiple domain spaces. It
> might be of some use for you.

I don't consider the powerpc virtual IRQs a solution for the problem.
While I believe you did the right thing for powerpc with generalizing
this over all its platforms, it really isn't more than a workaround
for the problem that we can't deal well with the static irq_desc
array.

When that problem is now getting worse on other architectures, we
should try to get it right on all of them, rather than spreading
the workaround further.

	Arnd <><
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