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