linux-kernel - Re: [PATCH v18 01/14] bitops: Introduce the for_each_set

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Message-Id: <20191009141855.310f1fa8bde58df0df27b8f0@linux-foundation.org>
Date:   Wed, 9 Oct 2019 14:18:55 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, andriy.shevchenko@...ux.intel.com,
        linux@...musvillemoes.dk, yamada.masahiro@...ionext.com,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        geert@...ux-m68k.org, preid@...ctromag.com.au, lukas@...ner.de,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v18 01/14] bitops: Introduce the for_each_set_clump8
 macro

On Wed,  9 Oct 2019 13:14:37 -0400 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.
> 
> ...
>  
> +#define for_each_set_clump8(start, clump, bits, size) \
> +	for ((start) = find_first_clump8(&(clump), (bits), (size)); \
> +	     (start) < (size); \
> +	     (start) = find_next_clump8(&(clump), (bits), (size), (start) + 8))
> +

It wouldn't hurt to give this some documentation.  In kerneldoc form, I
guess.