linux-kernel - Re: [PATCH v2 14/16] irqchip: mips-gic: Support local interrupts

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Date:	Fri, 5 Sep 2014 21:05:50 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Bresticker <abrestic@...omium.org>
cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jason Cooper <jason@...edaemon.net>,
	Jeffrey Deans <jeffrey.deans@...tec.com>,
	Markos Chandras <markos.chandras@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Arnd Bergmann <arnd@...db.de>,
	John Crispin <blogic@...nwrt.org>,
	David Daney <ddaney.cavm@...il.com>, linux-mips@...ux-mips.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/16] irqchip: mips-gic: Support local interrupts

On Fri, 5 Sep 2014, Andrew Bresticker wrote:
>  static void gic_mask_irq(struct irq_data *d)
>  {
> -	GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
> +	unsigned int irq = d->irq - gic_irq_base;
> +
> +	if (gic_is_local_irq(irq)) {
> +		GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK),
> +			 1 << GIC_INTR_BIT(gic_hw_to_local_irq(irq)));
> +	} else {
> +		GIC_CLR_INTR_MASK(irq);
> +	}
>  }
>  
>  static void gic_unmask_irq(struct irq_data *d)
>  {
> -	GIC_SET_INTR_MASK(d->irq - gic_irq_base);
> +	unsigned int irq = d->irq - gic_irq_base;
> +
> +	if (gic_is_local_irq(irq)) {
> +		GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK),
> +			 1 << GIC_INTR_BIT(gic_hw_to_local_irq(irq)));
> +	} else {
> +		GIC_SET_INTR_MASK(irq);
> +	}

Why are you adding a conditional in all these functions instead of
having two interrupt chips with separate callbacks and irqdata?

And looking at GIC_SET_INTR_MASK(irq) makes me shudder even more. The
whole thing can be replaced with the generic interrupt chip functions.

If you set it up proper, then there is not a single conditional or
runtime calculation of bitmasks, address offsets etc.

Thanks,

	tglx
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