| From | Muchun Song <> | Subject | [PATCH v5 21/21] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two | Date | Fri, 20 Nov 2020 14:43:25 +0800 |
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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@bytedance.com> --- 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; } -- 2.11.0
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