[PATCH v2 2/3] mm: change type of state in struct memory_block

The state of a memory block should be restricted to values specified
in the documentation of the memory hotplug API. However, since the
state field in the memory_block struct was defined as an unsigned
long, this restriction was not enforced at compile time.

With the introduction of the enum memory_block_state, it is now possible
to incorporate the desired semantics in the field declaration and
enforce these restrictions at compile time.

Signed-off-by: Israel Batista <[email protected]>
---
 drivers/base/memory.c  | 2 +-
 include/linux/memory.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 6d84a02cfa5d..3d17dd774947 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -198,7 +198,7 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 		break;
 	default:
 		WARN_ON(1);
-		return sysfs_emit(buf, "ERROR-UNKNOWN-%ld\n", mem->state);
+		return sysfs_emit(buf, "ERROR-UNKNOWN-%d\n", mem->state);
 	}
 
 	return sysfs_emit(buf, "%s\n", output);
diff --git a/include/linux/memory.h b/include/linux/memory.h
index f4e358477c6a..36d733283329 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -78,7 +78,7 @@ enum memory_block_state {
 
 struct memory_block {
 	unsigned long start_section_nr;
-	unsigned long state;		/* serialized by the dev->lock */
+	enum memory_block_state state; /* serialized by the dev->lock */
 	int online_type;		/* for passing data to online routine */
 	int nid;			/* NID for this memory block */
 	/*
-- 
2.51.0