linux-kernel - Re: [PATCH 1/4] gpio/aspeed: Fix incorrect number of banks

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Date:   Thu, 5 Sep 2019 11:08:13 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Rashmica Gupta <rashmica.g@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>
Subject: Re: [PATCH 1/4] gpio/aspeed: Fix incorrect number of banks

On Thu, Sep 5, 2019 at 2:17 AM Rashmica Gupta <rashmica.g@...il.com> wrote:
> On Wed, 2019-09-04 at 19:27 +0300, Andy Shevchenko wrote:
> > On Wed, Sep 4, 2019 at 9:14 AM Rashmica Gupta <rashmica.g@...il.com>
> > wrote:

> > > -       banks = gpio->config->nr_gpios >> 5;
> > > +       banks = (gpio->config->nr_gpios >> 5) + 1;
> >
> > Shouldn't be rather DIV_ROUND_UP(nr_gpios, sizeof(u32)) ?
>
> I agree that DIV_ROUND_UP is the right thing to use here, but wouldn't
> it be DIV_ROUND_UP(nr_gpios, 32)?

Right. Either this or BITS_PER_TYPE(u32).

> > >         gpio->dcache = devm_kcalloc(&pdev->dev,
> > >                                     banks, sizeof(u32),
> > > GFP_KERNEL);

-- 
With Best Regards,
Andy Shevchenko