linux-kernel - Re: [patch 00/47] Sparse irq rework

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Date:	Mon, 11 Oct 2010 22:34:46 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [patch 00/47] Sparse irq rework


> Hmm, that's probably a problem for all legacy interrupts which are
> never torn down once they are set up. And we set them all up during
> early boot.
> 
> So either we special case the legacy area or remove the warning
> alltogether.
> 
> Another option I discussed with Suresh recently is to remove the
> allocator in intr_remapping.c and just embedd irq_2_iommu into
> irq_cfg.

Just in case that's of use, on powerpc, we just special case the legacy
range. It's keep un-requestable unless somebody comes and explicitely
claims it (using a special flag for our virq scheme, typically only 8259
does it for us) and then we get 1:1 all pre-allocated and mostly
immutable.

Cheers,
Ben.

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