dpll: add reserved fields to dpll_device_ops and dpll_pin_ops structs

JIRA: https://issues.redhat.com/browse/RHEL-111904
Upstream Status: RHEL-only

Structures dpll_device_ops and dpll_pin_ops are protected by kABI,
add reserved fields to them to make them extensible. Also add
comments to dpll_device and dpll_pin structure we can freely modify
them.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>

Author: ivecera

drivers/dpll/dpll_core.h

@@ -24,6 +24,11 @@
  * @pin_refs:		stores pins registered within a dpll
  * @refcount:		refcount
  * @registration_list:	list of registered ops and priv data of dpll owners
+ *
+ * RHEL: The content of the structure is invisible for modules and also
+ * all its instances are allocated by DPLL core so it is safe to modify this
+ * structure but RH_KABI_EXTEND macro has to be used to avoid kABI checker
+ * errors.
  **/
 struct dpll_device {
 	u32 id;
@@ -48,6 +53,11 @@ struct dpll_device {
  * @rclk_dev_name:	holds name of device when pin can recover clock from it
  * @refcount:		refcount
  * @rcu:		rcu_head for kfree_rcu()
+ *
+ * RHEL: The content of the structure is invisible for modules and also
+ * all its instances are allocated by DPLL core so it is safe to modify this
+ * structure but RH_KABI_EXTEND macro has to be used to avoid kABI checker
+ * errors.
  **/
 struct dpll_pin {
 	u32 id;

include/linux/dpll.h

@@ -13,6 +13,8 @@
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 
+#include <linux/rh_kabi.h>
+
 struct dpll_device;
 struct dpll_pin;
 struct dpll_pin_esync;
@@ -38,6 +40,17 @@ struct dpll_device_ops {
 					void *dpll_priv,
 					enum dpll_feature_state *state,
 					struct netlink_ext_ack *extack);
+
+	RH_KABI_RESERVE(1)
+	RH_KABI_RESERVE(2)
+	RH_KABI_RESERVE(3)
+	RH_KABI_RESERVE(4)
+	RH_KABI_RESERVE(5)
+	RH_KABI_RESERVE(6)
+	RH_KABI_RESERVE(7)
+	RH_KABI_RESERVE(8)
+	RH_KABI_RESERVE(9)
+	RH_KABI_RESERVE(10)
 };
 
 struct dpll_pin_ops {
@@ -103,6 +116,23 @@ struct dpll_pin_ops {
 			 const struct dpll_device *dpll, void *dpll_priv,
 			 struct dpll_pin_esync *esync,
 			 struct netlink_ext_ack *extack);
+
+	RH_KABI_RESERVE(1)
+	RH_KABI_RESERVE(2)
+	RH_KABI_RESERVE(3)
+	RH_KABI_RESERVE(4)
+	RH_KABI_RESERVE(5)
+	RH_KABI_RESERVE(6)
+	RH_KABI_RESERVE(7)
+	RH_KABI_RESERVE(8)
+	RH_KABI_RESERVE(9)
+	RH_KABI_RESERVE(10)
+	RH_KABI_RESERVE(11)
+	RH_KABI_RESERVE(12)
+	RH_KABI_RESERVE(13)
+	RH_KABI_RESERVE(14)
+	RH_KABI_RESERVE(15)
+	RH_KABI_RESERVE(16)
 };
 
 struct dpll_pin_frequency {