We only can free the tail vmemmap pages of HugeTLB to the buddy allocator
when the size of struct page is a power of two.
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
mm/hugetlb_vmemmap.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index 51152e258f39..ad8fc61ea273 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -111,6 +111,11 @@ void __init hugetlb_vmemmap_init(struct hstate *h)
unsigned int nr_pages = pages_per_huge_page(h);
unsigned int vmemmap_pages;
+ if (!is_power_of_2(sizeof(struct page))) {
+ pr_info("disable freeing vmemmap pages for %s\n", h->name);
+ return;
+ }
+
vmemmap_pages = (nr_pages * sizeof(struct page)) >> PAGE_SHIFT;
/*
* The head page and the first tail page are not to be freed to buddy
--
2.11.0
