[PATCH v5 1/2] of: kobj: export of_node_ktype for use by modules

[Xu Yang <xu.yang_2@oss.nxp.com>]

From: Xu Yang <xu.yang_2@nxp.com>

of_node_init() is a static inline that references of_node_ktype when
CONFIG_OF_KOBJ=y. Any module that calls of_node_init() will therefore
have an unresolved reference to of_node_ktype at load time, because
the symbol is defined in drivers/of/kobj.c but was never exported.

This causes a modpost build error when CONFIG_OF_KOBJ=y and
CONFIG_DRIVER_PE_KUNIT_TEST=m:

  ERROR: modpost: "of_node_ktype"
  [drivers/base/test/property-entry-test.ko] undefined!

Add EXPORT_SYMBOL_GPL(of_node_ktype) so that GPL-licensed modules
such as the KUnit property-entry test can call of_node_init() without
hitting this linker error.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202607181651.RnUuV8n6-lkp@intel.com/
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v5:
 - new one
---
 drivers/of/kobj.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/of/kobj.c b/drivers/of/kobj.c
index 1bb61a2c3399..eacc53324d62 100644
--- a/drivers/of/kobj.c
+++ b/drivers/of/kobj.c
@@ -27,6 +27,7 @@ static void of_node_release(struct kobject *kobj)
 const struct kobj_type of_node_ktype = {
 	.release = of_node_release,
 };
+EXPORT_SYMBOL_GPL(of_node_ktype);
 
 static ssize_t of_node_property_read(struct file *filp, struct kobject *kobj,
 				const struct bin_attribute *bin_attr, char *buf,
-- 
2.34.1