kernel: param: initialize module_kset in a pure_initcall

Commit "driver core: platform: set mod_name in driver registration" will
set struct device_driver's mod_name member for platform driver
registration. For a driver to be registered with its mod_name set,
module_kset needs to be initialized, which currently happens in a
subsys_initcall in param_sysfs_init().  The tegra cbb drivers register
themselves before module_kset init, in a core_initcall. This works
currently because lookup_or_create_module_kobject(), which dereferences
module_kset via kset_find_obj(), is not called if mod_name is not set,
which is the case now.

So in preparation for the commit "driver core: platform: set mod_name in
driver registration", move module_kset init to pure_initcall level,
ensuring it happens before tegra cbb driver registration.

Suggested-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Gary Guo <gary@garyguo.net>
Co-developed-by: Rahul Bukte <rahul.bukte@sony.com>
Signed-off-by: Rahul Bukte <rahul.bukte@sony.com>
Signed-off-by: Shashank Balaji <shashank.mahadasyam@sony.com>
Link: https://patch.msgid.link/20260601101942.4002661-1-shashank.mahadasyam@sony.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

diff --git a/kernel/params.c b/kernel/params.c
index 74d620bc25217dabe5d7b1fd6cae81d9398ac135..a668863a4bb6397e3e2720df882454d8ad39385e 100644 (file)
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -942,9 +942,9 @@ const struct kobj_type module_ktype = {
 /*
  * param_sysfs_init - create "module" kset
  *
- * This must be done before the initramfs is unpacked and
- * request_module() thus becomes possible, because otherwise the
- * module load would fail in mod_sysfs_init.
+ * This must be done before any driver registration so that when a driver comes
+ * from a built-in module, the driver core can add the module under /sys/module
+ * and create the associated driver symlinks.
  */
 static int __init param_sysfs_init(void)
 {
@@ -957,7 +957,7 @@ static int __init param_sysfs_init(void)
 
        return 0;
 }
-subsys_initcall(param_sysfs_init);
+pure_initcall(param_sysfs_init);
 
 /*
  * param_sysfs_builtin_init - add sysfs version and parameter