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-rw-r--r--mm/memory_hotplug.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index ba201ab4c0e4..03a8825c5620 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -809,6 +809,11 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
int ret;
struct memory_notify arg;
+ /* We can only online full sections (e.g., SECTION_IS_ONLINE) */
+ if (WARN_ON_ONCE(!nr_pages ||
+ !IS_ALIGNED(pfn | nr_pages, PAGES_PER_SECTION)))
+ return -EINVAL;
+
mem_hotplug_begin();
/* associate pfn range with the zone */
@@ -1494,6 +1499,11 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
struct memory_notify arg;
char *reason;
+ /* We can only offline full sections (e.g., SECTION_IS_ONLINE) */
+ if (WARN_ON_ONCE(!nr_pages ||
+ !IS_ALIGNED(start_pfn | nr_pages, PAGES_PER_SECTION)))
+ return -EINVAL;
+
mem_hotplug_begin();
/*