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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | /* | |
3 | * Free some vmemmap pages of HugeTLB | |
4 | * | |
5 | * Copyright (c) 2020, Bytedance. All rights reserved. | |
6 | * | |
7 | * Author: Muchun Song <songmuchun@bytedance.com> | |
8 | */ | |
9 | #ifndef _LINUX_HUGETLB_VMEMMAP_H | |
10 | #define _LINUX_HUGETLB_VMEMMAP_H | |
11 | #include <linux/hugetlb.h> | |
12 | ||
13 | #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP | |
14 | int alloc_huge_page_vmemmap(struct hstate *h, struct page *head); | |
15 | void free_huge_page_vmemmap(struct hstate *h, struct page *head); | |
16 | void hugetlb_vmemmap_init(struct hstate *h); | |
17 | ||
18 | /* | |
19 | * How many vmemmap pages associated with a HugeTLB page that can be freed | |
20 | * to the buddy allocator. | |
21 | */ | |
22 | static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) | |
23 | { | |
24 | return h->nr_free_vmemmap_pages; | |
25 | } | |
26 | #else | |
27 | static inline int alloc_huge_page_vmemmap(struct hstate *h, struct page *head) | |
28 | { | |
29 | return 0; | |
30 | } | |
31 | ||
32 | static inline void free_huge_page_vmemmap(struct hstate *h, struct page *head) | |
33 | { | |
34 | } | |
35 | ||
36 | static inline void hugetlb_vmemmap_init(struct hstate *h) | |
37 | { | |
38 | } | |
39 | ||
40 | static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) | |
41 | { | |
42 | return 0; | |
43 | } | |
44 | #endif /* CONFIG_HUGETLB_PAGE_FREE_VMEMMAP */ | |
45 | #endif /* _LINUX_HUGETLB_VMEMMAP_H */ |