[PATCH v5 4/4] driver core: platform: set mod_name in driver registration

[Shashank Balaji]

On Mon, May 18, 2026 at 12:27:13PM +0200, Greg Kroah-Hartman wrote:
> On Mon, May 18, 2026 at 07:20:00PM +0900, Shashank Balaji wrote:
> > Pass KBUILD_MODNAME through the driver registration macro so that
> > the driver core can create the module symlink in sysfs for built-in
> > drivers, and fixup all callers.
> > 
> > The Rust platform adapter is updated to pass the module name through to the new
> > parameter.
> > 
> > Tested on qemu with:
> > - x86 defconfig + CONFIG_RUST
> > - arm64 defconfig + CONFIG_RUST + CONFIG_CORESIGHT stuff
> > 
> > Examples after this patch:
> > 
> >     /sys/bus/platform/drivers/...
> >         coresight-itnoc/module		-> coresight_tnoc
> >         coresight-static-tpdm/module	-> coresight_tpdm
> >         coresight-catu-platform/module	-> coresight_catu
> >         serial8250/module		-> 8250
> >         acpi-ged/module			-> acpi
> >         vmclock/module			-> ptp_vmclock
> > 
> > Co-developed-by: Rahul Bukte <rahul.bukte at sony.com>
> > Signed-off-by: Rahul Bukte <rahul.bukte at sony.com>
> > Signed-off-by: Shashank Balaji <shashank.mahadasyam at sony.com>
> > ---
> > This patch depends on patches 1, 2, 3
> > ---
> >  Documentation/driver-api/driver-model/platform.rst |  3 ++-
> >  drivers/base/platform.c                            | 21 ++++++++++++++-------
> >  drivers/hwtracing/coresight/coresight-core.c       |  5 +++--
> >  include/linux/coresight.h                          |  5 +++--
> >  include/linux/platform_device.h                    | 17 +++++++++--------
> >  rust/kernel/platform.rs                            |  4 +++-
> >  6 files changed, 34 insertions(+), 21 deletions(-)
> > 
> > diff --git a/Documentation/driver-api/driver-model/platform.rst b/Documentation/driver-api/driver-model/platform.rst
> > index cf5ff48d3115..9673470bded2 100644
> > --- a/Documentation/driver-api/driver-model/platform.rst
> > +++ b/Documentation/driver-api/driver-model/platform.rst
> > @@ -70,7 +70,8 @@ Kernel modules can be composed of several platform drivers. The platform core
> >  provides helpers to register and unregister an array of drivers::
> >  
> >  	int __platform_register_drivers(struct platform_driver * const *drivers,
> > -				      unsigned int count, struct module *owner);
> > +				      unsigned int count, struct module *owner,
> > +				      const char *mod_name);
> 
> Why can't you just use the owner->name value instead?  They are always
> the same here, right?

owner is NULL for built-in modules.