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1 // SPDX-License-Identifier: GPL-2.0
3 * Free some vmemmap pages of HugeTLB
5 * Copyright (c) 2020, Bytedance. All rights reserved.
7 * Author: Muchun Song <songmuchun@bytedance.com>
9 #ifndef _LINUX_HUGETLB_VMEMMAP_H
10 #define _LINUX_HUGETLB_VMEMMAP_H
11 #include <linux/hugetlb.h>
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
);
19 * How many vmemmap pages associated with a HugeTLB page that can be freed
20 * to the buddy allocator.
22 static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate
*h
)
24 return h
->nr_free_vmemmap_pages
;
27 static inline int alloc_huge_page_vmemmap(struct hstate
*h
, struct page
*head
)
32 static inline void free_huge_page_vmemmap(struct hstate
*h
, struct page
*head
)
36 static inline void hugetlb_vmemmap_init(struct hstate
*h
)
40 static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate
*h
)
44 #endif /* CONFIG_HUGETLB_PAGE_FREE_VMEMMAP */
45 #endif /* _LINUX_HUGETLB_VMEMMAP_H */