linux-kernel - Re: [PATCH 06/23] gpiolib: switch to simpler IDA interface

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Message-ID: <CAMRc=MeYw=tQABZ2ZGbFQC=yc-zzes6ohSzUJLOLBnEGHzeZhg@mail.gmail.com>
Date:   Mon, 7 Sep 2020 12:50:01 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-acpi@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 06/23] gpiolib: switch to simpler IDA interface

On Fri, Sep 4, 2020 at 6:41 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Fri, Sep 04, 2020 at 05:45:30PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > We don't need to specify any ranges when allocating IDs so we can switch
> > to ida_alloc() and ida_free() instead of the ida_simple_ counterparts.
> >
> > ida_simple_get(ida, 0, 0, gfp) is equivalent to
> > ida_alloc_range(ida, 0, UINT_MAX, gfp) which is equivalent to
> > ida_alloc(ida, gfp). Note: IDR will never actually allocate an ID
> > larger than INT_MAX.
>
> Have you considered switching to XArray API?
>

IDA uses an xarray internally but wraps it in a more straightforward
API. No need to use the low-level API IMO.

Bart