// SPDX-License-Identifier: GPL-2.0 /* * Optimize vmemmap pages associated with 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_OPTIMIZE_VMEMMAP int hugetlb_vmemmap_alloc(struct hstate *h, struct page *head); void hugetlb_vmemmap_free(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 * optimized and freed to the buddy allocator. */ static inline unsigned int hugetlb_optimize_vmemmap_pages(struct hstate *h) { return h->optimize_vmemmap_pages; } #else static inline int hugetlb_vmemmap_alloc(struct hstate *h, struct page *head) { return 0; } static inline void hugetlb_vmemmap_free(struct hstate *h, struct page *head) { } static inline void hugetlb_vmemmap_init(struct hstate *h) { } static inline unsigned int hugetlb_optimize_vmemmap_pages(struct hstate *h) { return 0; } #endif /* CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP */ #endif /* _LINUX_HUGETLB_VMEMMAP_H */