On 20.11.20 07:43, Muchun Song wrote:
We only can free the unused vmemmap to the buddy system when the
size of struct page is a power of two.
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
mm/hugetlb_vmemmap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index c3b3fc041903..7bb749a3eea2 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -671,7 +671,8 @@ void __init hugetlb_vmemmap_init(struct hstate *h)
unsigned int order = huge_page_order(h);
unsigned int vmemmap_pages;
- if (hugetlb_free_vmemmap_disabled) {
+ if (hugetlb_free_vmemmap_disabled ||
+ !is_power_of_2(sizeof(struct page))) {
pr_info("disable free vmemmap pages for %s\n", h->name);
return;
}
This patch should be merged into the original patch that introduced
vmemmap freeing.
--
Thanks,
David / dhildenb
