linux-kernel - Re: [PATCH v1 0/8] gpio: Get rid of ARCH_NR

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Message-ID: <CAHp75VeFbjRN7OE5MH0_bbx5aSerj+2F_vpBjRZhT3QQ+3wmng@mail.gmail.com>
Date:   Tue, 30 Aug 2022 23:21:18 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Keerthy <j-keerthy@...com>, Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux Documentation List <linux-doc@...r.kernel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Subject: Re: [PATCH v1 0/8] gpio: Get rid of ARCH_NR_GPIOS (v1)

On Tue, Aug 30, 2022 at 11:20 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Mon, Aug 29, 2022 at 7:17 PM Christophe Leroy
> <christophe.leroy@...roup.eu> wrote:
> >
> > Since commit 14e85c0e69d5 ("gpio: remove gpio_descs global array")
> > there is no limitation on the number of GPIOs that can be allocated
> > in the system since the allocation is fully dynamic.
> >
> > ARCH_NR_GPIOS is today only used in order to provide downwards
> > gpiobase allocation from that value, while static allocation is
> > performed upwards from 0. However that has the disadvantage of
> > limiting the number of GPIOs that can be registered in the system.
> >
> > To overcome this limitation without requiring each and every
> > platform to provide its 'best-guess' maximum number, rework the
> > allocation to allocate from 256 upwards, allowing approx 2 millions
> > of GPIOs.
> >
> > In the meantime, add a warning for drivers how are still doing
> > static allocation, so that in the future the static allocation gets
> > removed completely and dynamic allocation can start at base 0.
>
> For non-commented (by me or others) patches
> Reviewed-by: Andy Shevchenko <andy.shevchenko!gmail.com>

Should be
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> For the patch 1 if you are going to address as suggested by the author
> of the driver, you may also add my tag.



-- 
With Best Regards,
Andy Shevchenko