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

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Message-ID: <alpine.LFD.2.00.1010082346310.13094@localhost6.localdomain6>
Date:	Fri, 8 Oct 2010 23:50:42 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch 00/47] Sparse irq rework

On Wed, 6 Oct 2010, Yinghai Lu wrote:
> On 10/06/2010 09:01 PM, Thomas Gleixner wrote:
> > Well, I'm not too happy about this preallocated stuff anyway, which is
> > the reason for the warning below.
> >  
> >> [   80.726176] WARNING: at drivers/pci/intr_remapping.c:67 irq_2_iommu_alloc+0x52/0xdc()
> >> [   80.745935] Hardware name: Sun Fire X4800
> >> [   80.746179] irq_2_iommu!=NULL irq 8
> > 
> 
> no, irq_2_iommu are all dynamically allocated even for irq < 16.

I know. I was talking about the preallocated irq descriptors and the
handling of it in general.

Nevertheless, that irq_2_iommu stuff does not need it's own allocation
function. It's bound to a specific irq_cfg anyway, so the next logical
step is to move irq_2_iommu into struct irq_cfg and get rid of the
extra allocation/free in intr_remapping.c.

Thanks,
	
	tglx
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