// SPDX-License-Identifier: GPL-2.0 /* * Free some vmemmap pages of HugeTLB * * Copyright (c) 2020, Bytedance. All rights reserved. * * Author: Muchun Song <songmuchun@bytedance.com> */ #ifndef _LINUX_HUGETLB_VMEMMAP_H #define _LINUX_HUGETLB_VMEMMAP_H #include <linux/hugetlb.h> #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP int alloc_huge_page_vmemmap(struct hstate *h, struct page *head); void free_huge_page_vmemmap(struct hstate *h, struct page *head); void hugetlb_vmemmap_init(struct hstate *h); /* * How many vmemmap pages associated with a HugeTLB page that can be freed * to the buddy allocator. */ static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) { return h->nr_free_vmemmap_pages; } #else static inline int alloc_huge_page_vmemmap(struct hstate *h, struct page *head) { return 0; } static inline void free_huge_page_vmemmap(struct hstate *h, struct page *head) { } static inline void hugetlb_vmemmap_init(struct hstate *h) { } static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) { return 0; } #endif /* CONFIG_HUGETLB_PAGE_FREE_VMEMMAP */ #endif /* _LINUX_HUGETLB_VMEMMAP_H */