Subject: [PATCH v3 0/4] Enable sysfs module symlink for more built-in drivers

From: Shashank Balaji <[email-masked]>
Date: Wed, 22 Apr 2026 18:49:02 +0900

struct device_driver's mod_name is not set by a number of bus' driver registration
functions. Without that, built-in drivers don't have the module symlink in sysfs.
We want this to go from unbound driver name -> module name -> kernel config name.
This is useful on embedded platforms to minimize kernel config, reduce kernel size,
and reduce boot time.

In order to achieve this, mod_name has to be set to KBUILD_MODNAME, and this has
to be done for all buses which don't yet do this.

Here are some treewide stats:
- 110 registration functions across all bus types
- 20 of them set mod_name
- Remaining 90 do not set mod_name:
    1. 36 functions under pattern 1:
        They have a __register function + register macro. KBUILD_MODNAME needs to
        be passed and the function needs to take mod_name as input.
    2. 42 functions under pattern 2:
        These have no macro wrapper. They need a double-underscore rename + macro
        wrapper to make them similar to pattern 1.
    3. Remaining 12 do not have such a clean registration interface. More analysis
       is required.

We plan to start with pattern 1, since it's the easiest category of changes.
Within that, for now we're only sending the platform patch. If we get the go-ahead
on that, we'll send the remaining ones.

Patch 3 depends on patches 1 and 2.

Co-developed-by: Rahul Bukte <[email-masked]>
Signed-off-by: Rahul Bukte <[email-masked]>
Signed-off-by: Shashank Balaji <[email-masked]>
---
Changes in v3:
- Initialize module_kset on-demand (Greg)
- Make coresight driver registration happen through a macro (Greg)
- Split up the patch adding mod_name to platform driver registrations (Greg)
- Link to v2: https://patch.msgid.link/[email-masked]

Changes in v2:
- Drop acpi patch, send platform instead (Rafael)
- Link to v1: https://patch.msgid.link/[email-masked]

To: Suzuki K Poulose <[email-masked]>
To: Mike Leach <[email-masked]>
To: James Clark <[email-masked]>
To: Alexander Shishkin <[email-masked]>
To: Maxime Coquelin <[email-masked]>
To: Alexandre Torgue <[email-masked]>
To: Greg Kroah-Hartman <[email-masked]>
To: "Rafael J. Wysocki" <[email-masked]>
To: Danilo Krummrich <[email-masked]>
To: Miguel Ojeda <[email-masked]>
To: Boqun Feng <[email-masked]>
To: Gary Guo <[email-masked]>
To: Björn Roy Baron <[email-masked]>
To: Benno Lossin <[email-masked]>
To: Andreas Hindborg <[email-masked]>
To: Alice Ryhl <[email-masked]>
To: Trevor Gross <[email-masked]>
To: Richard Cochran <[email-masked]>
To: Jonathan Corbet <[email-masked]>
To: Shuah Khan <[email-masked]>
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Cc: Shashank Balaji <[email-masked]>
Cc: Rahul Bukte <[email-masked]>
Cc: Daniel Palmer <[email-masked]>
Cc: Tim Bird <[email-masked]>

---
Shashank Balaji (4):
      kernel: param: initialize module_kset on-demand
      coresight: pass THIS_MODULE implicitly through a macro
      driver core: platform: set mod_name in driver registration
      docs: driver-api: add mod_name argument to __platform_register_drivers()

 Documentation/driver-api/driver-model/platform.rst |  3 +-
 drivers/base/platform.c                            | 21 +++++++----
 drivers/hwtracing/coresight/coresight-catu.c       |  2 +-
 drivers/hwtracing/coresight/coresight-core.c       |  9 ++---
 drivers/hwtracing/coresight/coresight-cpu-debug.c  |  3 +-
 drivers/hwtracing/coresight/coresight-funnel.c     |  3 +-
 drivers/hwtracing/coresight/coresight-replicator.c |  3 +-
 drivers/hwtracing/coresight/coresight-stm.c        |  2 +-
 drivers/hwtracing/coresight/coresight-tmc-core.c   |  2 +-
 drivers/hwtracing/coresight/coresight-tnoc.c       |  2 +-
 drivers/hwtracing/coresight/coresight-tpdm.c       |  3 +-
 drivers/hwtracing/coresight/coresight-tpiu.c       |  2 +-
 include/linux/coresight.h                          |  7 ++--
 include/linux/platform_device.h                    | 17 ++++-----
 kernel/params.c                                    | 41 +++++++++++++---------
 rust/kernel/platform.rs                            |  4 ++-
 16 files changed, 72 insertions(+), 52 deletions(-)
---
base-commit: 6596a02b207886e9e00bb0161c7fd59fea53c081
change-id: 20260416-acpi_mod_name-f645a76e337b

Best regards,
--  
Shashank Balaji <[email-masked]>