linux-kernel - Re: [PATCH 1/9] serdev: Convert to_serdev_device() and to_serdev

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Message-ID: <vajsqzw2z5jljmlys6gk3eltj3b2fr4xymyv252idk57lk3wm3@gfff56nn25is>
Date: Thu, 13 Nov 2025 10:45:35 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: manivannan.sadhasivam@....qualcomm.com, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas.schier@...ux.dev>, 
	Hans de Goede <hansg@...nel.org>, Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	Mark Pearson <mpearson-lenovo@...ebb.ca>, "Derek J. Clark" <derekjohn.clark@...il.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Marcel Holtmann <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	Bartosz Golaszewski <brgl@...ev.pl>, linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, platform-driver-x86@...r.kernel.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org, linux-bluetooth@...r.kernel.org, 
	linux-pm@...r.kernel.org, Stephan Gerhold <stephan.gerhold@...aro.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: Re: [PATCH 1/9] serdev: Convert to_serdev_device() and
 to_serdev_controller() helpers to macros

On Wed, Nov 12, 2025 at 03:13:54PM -0600, Rob Herring wrote:
> On Wed, Nov 12, 2025 at 8:45 AM Manivannan Sadhasivam via B4 Relay
> <devnull+manivannan.sadhasivam.oss.qualcomm.com@...nel.org> wrote:
> >
> > From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> >
> > If these helpers receive the 'const struct device' pointer, then the const
> > qualifier will get dropped, leading to below warning:
> >
> > warning: passing argument 1 of ‘to_serdev_device_driver’ discards 'const'
> > qualifier from pointer target type [-Wdiscarded-qualifiers]
> >
> > This is not an issue as of now, but with the future commits adding serdev
> > device based driver matching, this warning will get triggered. Hence,
> > convert these helpers to macros so that the qualifier get preserved.
> >
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> > ---
> >  include/linux/serdev.h | 10 ++--------
> >  1 file changed, 2 insertions(+), 8 deletions(-)
> >
> > diff --git a/include/linux/serdev.h b/include/linux/serdev.h
> > index 34562eb99931d808e885ce5022b8aa4577566885..ab185cac556380dfa3cdf94b7af6ee168b677587 100644
> > --- a/include/linux/serdev.h
> > +++ b/include/linux/serdev.h
> > @@ -49,10 +49,7 @@ struct serdev_device {
> >         struct mutex write_lock;
> >  };
> >
> > -static inline struct serdev_device *to_serdev_device(struct device *d)
> > -{
> > -       return container_of(d, struct serdev_device, dev);
> 
> See container_of_const()
> 

Ah, didn't know about it. Will use it in v2.

- Mani

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