linux-kernel - Re: [RFC patch 7/8] genirq: generic chip: Add linear irq domain support

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Date:	Fri, 3 May 2013 23:23:01 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>, Arnd Bergmann <arnd@...db.de>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Jean-Francois Moine <moinejf@...e.fr>,
	Gerlando Falauto <gerlando.falauto@...mile.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC patch 7/8] genirq: generic chip: Add linear irq domain
	support

On Fri, May 03, 2013 at 09:50:53PM -0000, Thomas Gleixner wrote:
> +	/* Init mask cache ? */
> +	if (dgc->gc_flags & IRQ_GC_INIT_MASK_CACHE) {
> +		raw_spin_lock_irqsave(&gc->lock, flags);
> +		gc->mask_cache = irq_reg_readl(gc->reg_base + ct->regs.mask);
> +		raw_spin_unlock_irqrestore(&gc->lock, flags);
> +	}

This looks a little weird to me - it seems that it'll re-read this
each time any irq is mapped in the domain, which is probably not
wanted.
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