linux-kernel - Re: [PATCH v9 1/9] bitops: Introduce the for_each_set

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Date:   Tue, 12 Mar 2019 09:14:14 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v9 1/9] bitops: Introduce the for_each_set_clump8 macro

On Tue, Mar 12, 2019 at 7:04 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> On Sun, Mar 3, 2019 at 4:48 PM William Breathitt Gray
> <vilhelm.gray@...il.com> wrote:
> >
> > This macro iterates for each 8-bit group of bits (clump) with set bits,
> > within a bitmap memory region. For each iteration, "start" is set to the
> > bit offset of the found clump, while the respective clump value is
> > stored to the location pointed by "clump". Additionally, the
> > bitmap_get_value8 and bitmap_set_value8 functions are introduced to
> > respectively get and set an 8-bit value in a bitmap memory region.

> > +/**
> > + * bitmap_get_value8 - get an 8-bit value within a memory region
> > + * @bitmap: address to the bitmap memory region
> > + * @size: bitmap size in number of bits
> > + * @start: bit offset of the 8-bit value
> > + *
> > + * Returns the 8-bit value located at the @start bit offset within the @bitmap
> > + * memory region.
> > + */
> > +unsigned long bitmap_get_value8(const unsigned long *const bitmap,
> > +                               const unsigned int size,
> > +                               const unsigned int start)
>
>
> The comment says this function returns '8-bit value'.
>
> The return type should be 'u8' instead of 'unsigned long', then.
>
> Same for other helpers.

This is done in a way to be consistent with the rest of bitmap API.
None of them returns boolean, for example, for single bit.

-- 
With Best Regards,
Andy Shevchenko