linux-kernel - Re: [RFC PATCH] irqchip: add dumb demultiplexer implementation

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Message-ID: <20150113180017.66efeda7@bbrezillon>
Date:	Tue, 13 Jan 2015 18:00:17 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [RFC PATCH] irqchip: add dumb demultiplexer implementation

On Tue, 13 Jan 2015 11:38:14 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > +/**
> > + *	handle_dumb_demux_irq - Dumb demuxer irq handle function.
> > + *	@irq:	the interrupt number
> > + *	@desc:	the interrupt description structure for this irq
> > + *
> > + *	Dumb demux interrupts are sent from a demultiplexing interrupt handler
> > + *	which is not able to decide which child interrupt interrupt handler
> > + *	should be called.
> > + *
> > + *	Note: The caller is expected to handle the ack, clear, mask and
> > + *	unmask issues if necessary.
> > + */
> > +irqreturn_t
> > +handle_dumb_demux_irq(unsigned int irq, struct irq_desc *desc)
> > +{
> > +	irqreturn_t retval = IRQ_NONE;
> > +
> > +	raw_spin_lock(&desc->lock);
> > +
> > +	if (!irq_may_run(desc))
> > +		goto out_unlock;
> > +
> > +	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
> > +	kstat_incr_irqs_this_cpu(irq, desc);
> > +
> > +	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
> > +		desc->istate |= IRQS_PENDING;
> > +		goto out_unlock;
> > +	}
> > +
> > +	retval = handle_irq_event_no_spurious_check(desc);
> > +
> > +out_unlock:
> > +	raw_spin_unlock(&desc->lock);
> > +
> > +	return retval;
> > +}
> > +EXPORT_SYMBOL_GPL(handle_dumb_demux_irq);
> 
> This should go into the new file as well, so it gets compiled out when
> not enabled.

Actually, I can't move that function out of kernel/irq/chip.c because
it calls irq_may_run which is statically defined in this file.
Should I export this function or just enclose it in a
#ifdef DUMB_IRQ_DEMUX section ?


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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