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

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Message-ID: <CAKohpom76zu0ec0rgcVH8J5hmAypS9WJ+i_bB43P3aFYzDW2Mw@mail.gmail.com>
Date:	Fri, 20 Jun 2014 13:49:36 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
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 20 June 2014 13:36, Thomas Gleixner <tglx@...utronix.de> wrote:
> 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?

>> +               shirq_blocks[i]->mask = ((0x1 << shirq_blocks[i]->nr_irqs) - 1)
>> +                                       << shirq_blocks[i]->offset;

Just for better readability as it doesn't have magic numbers in it
and the performance impact wouldn't be much as its done just
once on boot.
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