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-rw-r--r--mm/memory_hotplug.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 46b489cacdd8..247d66675a91 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1070,6 +1070,23 @@ out:
return ret;
}
+static int check_hotplug_memory_range(u64 start, u64 size)
+{
+ u64 start_pfn = start >> PAGE_SHIFT;
+ u64 nr_pages = size >> PAGE_SHIFT;
+
+ /* Memory range must be aligned with section */
+ if ((start_pfn & ~PAGE_SECTION_MASK) ||
+ (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) {
+ pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n",
+ (unsigned long long)start,
+ (unsigned long long)size);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
int __ref add_memory(int nid, u64 start, u64 size)
{
@@ -1079,6 +1096,10 @@ int __ref add_memory(int nid, u64 start, u64 size)
struct resource *res;
int ret;
+ ret = check_hotplug_memory_range(start, size);
+ if (ret)
+ return ret;
+
lock_memory_hotplug();
res = register_memory_resource(start, size);
@@ -1786,6 +1807,8 @@ void __ref remove_memory(int nid, u64 start, u64 size)
{
int ret;
+ BUG_ON(check_hotplug_memory_range(start, size));
+
lock_memory_hotplug();
/*