linux-kernel - Re: [PATCH 1/6] auxbus: make to_auxiliary_drv accept and return a constant pointer

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Message-ID: <2024061212-excusable-dissuade-379b@gregkh>
Date: Wed, 12 Jun 2024 10:20:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: linux-kernel@...r.kernel.org, Dave Ertman <david.m.ertman@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Bingbu Cao <bingbu.cao@...el.com>,
	Tianshu Qiu <tian.shu.qiu@...el.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Michael Chan <michael.chan@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
	Daniel Baluta <daniel.baluta@....com>,
	Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Richard Cochran <richardcochran@...il.com>,
	linux-media@...r.kernel.org, netdev@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org, linux-rdma@...r.kernel.org,
	sound-open-firmware@...a-project.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH 1/6] auxbus: make to_auxiliary_drv accept and return a
 constant pointer

On Tue, Jun 11, 2024 at 03:50:47PM +0200, Przemek Kitszel wrote:
> On 6/11/24 15:01, Greg Kroah-Hartman wrote:
> > In the quest to make struct device constant, start by making
> 
> just curious, how far it will go? eg. do you plan to convert
> get/put_device() to accept const?

Ugh, that should have said "in the quest to make struct device_driver
const", not device.  devices obviously can't be constant everywhere as
they are dynamically created.

> or convert devlink API to accept
> consts?

Again, sorry, no, typo on my part.

> 
> > to_auziliary_drv() return a constant pointer so that drivers that call
> 
> typo: s/auz/aux/

I'll fix this typo up, and the one above, when I commit it.

> 
> > this can be fixed up before the driver core changes.
> > 
> > As the return type previously was not constant, also fix up all callers
> > that were assuming that the pointer was not going to be a constant one
> > in order to not break the build.
> > 
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> 
> [...]
> 
> > diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> > index 0f17fc1181d2..7341e7c4ef24 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> > @@ -2784,7 +2784,7 @@ static struct ice_pf *
> >   ice_ptp_aux_dev_to_owner_pf(struct auxiliary_device *aux_dev)
> >   {
> >   	struct ice_ptp_port_owner *ports_owner;
> > -	struct auxiliary_driver *aux_drv;
> > +	const struct auxiliary_driver *aux_drv;
> >   	struct ice_ptp *owner_ptp;
> >   	if (!aux_dev->dev.driver)
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
> > index 47e7c2639774..9a79674d27f1 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
> > @@ -349,7 +349,7 @@ int mlx5_attach_device(struct mlx5_core_dev *dev)
> >   {
> >   	struct mlx5_priv *priv = &dev->priv;
> >   	struct auxiliary_device *adev;
> > -	struct auxiliary_driver *adrv;
> > +	const struct auxiliary_driver *adrv;
> 
> nit: in netdev we do maintain RCT order of initialization

what does that mean?  Nothing is being initialized here.

thanks,

greg k-h