[PATCH v7 02/10] mm/memory_hotplug: add mhp_online_type_to_str() and export string helpers

[Gregory Price <gourry@gourry.net>]

Add mhp_online_type_to_str() as the inverse of mhp_online_type_from_str(),
and export both so a driver can render and parse the memory online type
through its own sysfs interface.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Dan Williams <djbw@kernel.org>
Signed-off-by: Gregory Price <gourry@gourry.net>
---
 drivers/base/memory.c          | 9 +++++++++
 include/linux/memory_hotplug.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index bcfe2d9f4adbd..5eead3346f1e3 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -46,6 +46,15 @@ int mhp_online_type_from_str(const char *str)
 	}
 	return -EINVAL;
 }
+EXPORT_SYMBOL_GPL(mhp_online_type_from_str);
+
+const char *mhp_online_type_to_str(int online_type)
+{
+	if (online_type < 0 || online_type >= (int)ARRAY_SIZE(online_type_to_str))
+		return NULL;
+	return online_type_to_str[online_type];
+}
+EXPORT_SYMBOL_GPL(mhp_online_type_to_str);
 
 #define to_memory_block(dev) container_of(dev, struct memory_block, dev)
 
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index f04b915678dbd..8f6da2656f4e2 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -127,6 +127,7 @@ extern int arch_add_memory(int nid, u64 start, u64 size,
 extern u64 max_mem_size;
 
 extern int mhp_online_type_from_str(const char *str);
+const char *mhp_online_type_to_str(int online_type);
 
 /* If movable_node boot option specified */
 extern bool movable_node_enabled;
-- 
2.53.0-Meta