linux-kernel - Re: [PATCH 2/2] gpio: aggregator: Use bitmap

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Message-ID: <CAMpxmJWGckzicz6FddXybcJh-hb+-hoGbV29Z3BA61RVQ1nQDQ@mail.gmail.com>
Date:   Wed, 24 Jun 2020 14:16:03 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] gpio: aggregator: Use bitmap_parselist() for parsing
 GPIO offsets

wt., 23 cze 2020 o 16:57 Geert Uytterhoeven <geert+renesas@...der.be>
napisał(a):
>
> Replace the custom code to parse GPIO offsets and/or GPIO offset ranges
> by a call to bitmap_parselist(), and an iteration over the returned bit
> mask.
>
> This should have no impact on the format of the configuration parameters
> written to the "new_device" virtual file in sysfs.
>
> Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> I'm not super happy with the mask[] array, which is on the stack.
> But there is no real limit on the number of GPIO lines provided by a
> single gpiochip, except for the global ARCH_NR_GPIOS.

Why not allocate it with bitmap_zalloc() then?

Bart