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-rw-r--r--mm/hugetlb.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 87e11d8ad536..603bdd01ec2c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1443,13 +1443,14 @@ static void dissolve_free_huge_page(struct page *page)
{
spin_lock(&hugetlb_lock);
if (PageHuge(page) && !page_count(page)) {
- struct hstate *h = page_hstate(page);
- int nid = page_to_nid(page);
- list_del(&page->lru);
+ struct page *head = compound_head(page);
+ struct hstate *h = page_hstate(head);
+ int nid = page_to_nid(head);
+ list_del(&head->lru);
h->free_huge_pages--;
h->free_huge_pages_node[nid]--;
h->max_huge_pages--;
- update_and_free_page(h, page);
+ update_and_free_page(h, head);
}
spin_unlock(&hugetlb_lock);
}
@@ -1457,7 +1458,8 @@ static void dissolve_free_huge_page(struct page *page)
/*
* Dissolve free hugepages in a given pfn range. Used by memory hotplug to
* make specified memory blocks removable from the system.
- * Note that start_pfn should aligned with (minimum) hugepage size.
+ * Note that this will dissolve a free gigantic hugepage completely, if any
+ * part of it lies within the given range.
*/
void dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
{
@@ -1466,7 +1468,6 @@ void dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
if (!hugepages_supported())
return;
- VM_BUG_ON(!IS_ALIGNED(start_pfn, 1 << minimum_order));
for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << minimum_order)
dissolve_free_huge_page(pfn_to_page(pfn));
}