linux-kernel - Re: [patch 08/13] irqchip: spear_shirq: Precalculate status mask

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Date:	Fri, 20 Jun 2014 10:06:08 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Viresh Kumar <viresh.kumar@...aro.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Shiraz Hashim <shiraz.linux.kernel@...il.com>,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [patch 08/13] irqchip: spear_shirq: Precalculate status mask

On Fri, 20 Jun 2014, Viresh Kumar wrote:
> On Fri, Jun 20, 2014 at 3:04 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > @@ -176,6 +186,7 @@ static struct spear_shirq spear320_shirq
> >  static struct spear_shirq spear320_shirq_intrcomm_ras = {
> >         .offset         = 11,
> >         .nr_irqs        = 11,
> > +       .mask           = ((0x1 << 11) - 1) << 11,
> >         .regs = {
> >                 .enb_reg = -1,
> >                 .status_reg = SPEAR320_INT_STS_MASK_REG,
> 
> If you like, maybe this instead of above diff:

What's wrong with letting the compiler fill it in?
 
> diff --git a/drivers/irqchip/spear-shirq.c b/drivers/irqchip/spear-shirq.c
> index 3fdda3a..40c5c1b 100644
> --- a/drivers/irqchip/spear-shirq.c
> +++ b/drivers/irqchip/spear-shirq.c
> @@ -281,6 +281,8 @@ static int __init shirq_init(struct spear_shirq
> **shirq_blocks, int block_nr,
>                 shirq_blocks[i]->base = base;
>                 shirq_blocks[i]->irq_base = irq_find_mapping(shirq_domain,
>                                 hwirq);
> +               shirq_blocks[i]->mask = ((0x1 << shirq_blocks[i]->nr_irqs) - 1)
> +                                       << shirq_blocks[i]->offset;
>                 shirq_blocks[i]->irq = irq_of_parse_and_map(np, i);
> 
>                 spear_shirq_register(shirq_blocks[i]);
> 
> 
> > @@ -239,7 +250,7 @@ static void shirq_handler(unsigned irq,
> >
> >         chip->irq_ack(idata);
> >
> > -       mask = ((0x1 << shirq->nr_irqs) - 1) << shirq->offset;
> > +       mask = shirq->mask;
> >         while ((val = readl(shirq->base + shirq->regs.status_reg) &
> >                                 mask)) {
> >
> >
> >
> 
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