[PATCH v2 3/3] mm: change type of parameter for memory_notify

[Israel Batista <linux@israelbatista.dev.br>]

The memory_notify function is responsible for sending events related to
memory hotplugging to a notification queue. Since all the events must
match one of the values from the enum memory_block_state, it is
appropriate to change the function parameter type to make this
condition explicit at compile time.

Signed-off-by: Israel Batista <linux@israelbatista.dev.br>
---
 drivers/base/memory.c  | 4 ++--
 include/linux/memory.h | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 3d17dd774947..c03f3b5e5e6f 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -204,9 +204,9 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 	return sysfs_emit(buf, "%s\n", output);
 }
 
-int memory_notify(unsigned long val, void *v)
+int memory_notify(enum memory_block_state state, void *v)
 {
-	return blocking_notifier_call_chain(&memory_chain, val, v);
+	return blocking_notifier_call_chain(&memory_chain, state, v);
 }
 
 #if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG)
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 36d733283329..6a2456686bf4 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -141,7 +141,7 @@ static inline int register_memory_notifier(struct notifier_block *nb)
 static inline void unregister_memory_notifier(struct notifier_block *nb)
 {
 }
-static inline int memory_notify(unsigned long val, void *v)
+static inline int memory_notify(enum memory_block_state state, void *v)
 {
 	return 0;
 }
@@ -165,7 +165,7 @@ int create_memory_block_devices(unsigned long start, unsigned long size,
 				struct memory_group *group);
 void remove_memory_block_devices(unsigned long start, unsigned long size);
 extern void memory_dev_init(void);
-extern int memory_notify(unsigned long val, void *v);
+extern int memory_notify(enum memory_block_state state, void *v);
 extern struct memory_block *find_memory_block(unsigned long section_nr);
 typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *);
 extern int walk_memory_blocks(unsigned long start, unsigned long size,
-- 
2.51.0