linux-kernel - Re: [PATCH 3/5] driver core: make struct device

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Date:   Wed, 23 Nov 2022 15:34:56 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Maximilian Luz <luzmaximilian@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Stefan Richter <stefanr@...6.in-berlin.de>,
        Wolfram Sang <wsa@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Ming Lei <ming.lei@...hat.com>,
        Jilin Yuan <yuanjilin@...rlc.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Won Chung <wonchung@...gle.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-block@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-i3c@...ts.infradead.org, linux-input@...r.kernel.org,
        linux-media@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-usb@...r.kernel.org, linux1394-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 3/5] driver core: make struct device_type.uevent() take a
 const *

On Wed, Nov 23, 2022 at 02:14:31PM +0100, Maximilian Luz wrote:
> On 11/23/22 13:25, Greg Kroah-Hartman wrote:
> > The uevent() callback in struct device_type should not be modifying the
> > device that is passed into it, so mark it as a const * and propagate the
> > function signature changes out into all relevant subsystems that use
> > this callback.

[...]

> > -static inline struct ssam_device *to_ssam_device(struct device *d)
> > +static inline struct ssam_device *to_ssam_device(const struct device *d)
> >   {
> >   	return container_of(d, struct ssam_device, dev);
> >   }
> 
> I am slightly conflicted about this change as that now more or less
> implicitly drops the const. So I'm wondering if it wouldn't be better to
> either create a function specifically for const pointers or to just
> open-code it in the instance above.
> 
> I guess we could also convert this to a macro. Then at least there
> wouldn't be an explicit and potentially misleading const-conversion
> indicated in the function signature.

This is an intermediate step as far as I know since moving container_of to
recognize const is a bit noisy right now. I guess you can find a discussion
on the topic between Greg and Sakari.

-- 
With Best Regards,
Andy Shevchenko