linux-kernel - Re: [RFT PATCH v2] spi: bcm2835: reduce the abuse of the GPIO API

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMRc=MdX3jtssO_zWCp9g5r00esGgASNeN437aJheRobVyqZcQ@mail.gmail.com>
Date:   Fri, 1 Sep 2023 14:33:03 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Mark Brown <broonie@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>, linux-spi@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [RFT PATCH v2] spi: bcm2835: reduce the abuse of the GPIO API

On Fri, Sep 1, 2023 at 2:31 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Fri, Sep 01, 2023 at 02:15:39PM +0200, Linus Walleij wrote:
> > On Fri, Sep 1, 2023 at 1:15 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> > > +       struct gpiod_lookup_table *lookup __free(kfree) = NULL;
>
> > Whoa!
> > This is really neat.
> > As noted, it will confuse static checkers at no end, but they just have
> > to adopt. (CC to Dan C if he now runs into this.)
>
> It also doesn't look amazing for humans, it's very not C like...

Once it's widely adopted, you'll see how much clearer and less prone
to bugs in error paths the code becomes with autopointers. It's 2023
dammit, if we can't have flying cars, let's at least get some RAII
into the kernel. :)

Bart