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

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Date:   Wed, 23 Nov 2022 18:01:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        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>,
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        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
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        Jilin Yuan <yuanjilin@...rlc.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        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,
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        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 12:25:32PM -0400, Jason Gunthorpe wrote:
> On Wed, Nov 23, 2022 at 04:37:59PM +0100, Greg Kroah-Hartman wrote:
> > static inline struct device *__kobj_to_dev(struct kobject *kobj)
> > {
> >         return container_of(kobj, struct device, kobj);
> > }
> > 
> > static inline const struct device *__kobj_to_dev_const(const struct kobject *kobj)
> > {
> >         return container_of(kobj, const struct device, kobj);
> > }
> > 
> > /*
> >  * container_of() will happily take a const * and spit back a non-const * as it
> >  * is just doing pointer math.  But we want to be a bit more careful in the
> >  * driver code, so manually force any const * of a kobject to also be a const *
> >  * to a device.
> >  */
> > #define kobj_to_dev(kobj)                                       \
> >         _Generic((kobj),                                        \
> >                  const struct kobject *: __kobj_to_dev_const,   \
> >                  struct kobject *: __kobj_to_dev)(kobj)
> > 
> > 
> > Want me to do the same thing here as well?
> 
> It would be nice to have a shared macro code gen all of the above
> instead of copy and pasting it. Then maybe other cases beyond struct
> device could adopt const too..

I think I tried to create such a beast, but failed, so ended up
open-coding it in a few places in the USB headers already.  I can try it
again, but the redirection gets tricky (defines creating defines...)

thanks,

greg k-h