[PATCH v6 1/2] of: kobj: export of_node_ktype for use by modules

[Xu Yang]

From: Xu Yang <xu.yang_2@xxxxxxx>

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

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

---
Changes in v6:
 - use EXPORT_SYMBOL_IF_KUNIT as suggested by Andy Shevchenko
Changes in v5:
 - new one
---
 drivers/of/kobj.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/kobj.c b/drivers/of/kobj.c
index 1bb61a2c3399..081b8fa38603 100644
--- a/drivers/of/kobj.c
+++ b/drivers/of/kobj.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/of.h>
 #include <linux/slab.h>
+#include <kunit/visibility.h>
 
 #include "of_private.h"
 
@@ -27,6 +28,7 @@ static void of_node_release(struct kobject *kobj)
 const struct kobj_type of_node_ktype = {
 	.release = of_node_release,
 };
+EXPORT_SYMBOL_IF_KUNIT(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