linux-kernel - Re: [PATCH v5 09/10] gpio: Add a driver for Cadence I3C GPIO expander

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Date:   Thu, 28 Jun 2018 03:00:58 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Linux Documentation List <linux-doc@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        Alicja Jurasik-Urbaniak <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vitor Soares <Vitor.Soares@...opsys.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>,
        Przemyslaw Gaj <pgaj@...ence.com>,
        Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH v5 09/10] gpio: Add a driver for Cadence I3C GPIO expander

On Thu, Jun 28, 2018 at 1:54 AM, Joe Perches <joe@...ches.com> wrote:
> On Wed, 2018-06-27 at 21:36 +0200, Boris Brezillon wrote:
>> I mean, kzalloc() is not deprecated AFAIK and I don't really see the
>> benefit of using kmalloc_array(), but if that makes you happy, let's go
>> for kmalloc_array().
>
> kcalloc

IIRC in the original code kmalloc(x*y) is used.

>> I do run checkpatch --strict and fix most of the thing reported except
>> those hurting readability. I don't remember seeing checkpatch complain
>> about kzalloc() usage, and I guess it's not smart enough to detect that
>> for_each_bit_set() can be used to replace the "for() if (BIT(x) & val)"
>> pattern.
>
> That would not an appropriate conversion suggestion in any case.
> coccinelle could at least look at whether or not x is allocated
> as a bitmap via DECLARE_BITMAP or bitmap_alloc

Huh?!

bitmap operations are working against unsigned long *. one long is
also a bitmap.
So, that coccinelle scripts must be fixed accordingly.

-- 
With Best Regards,
Andy Shevchenko