| // 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 |
| void free_huge_page_vmemmap(struct hstate *h, struct page *head); |
| |
| /* |
| * How many vmemmap pages associated with a HugeTLB page that can be freed |
| * to the buddy allocator. |
| * |
| * Todo: Returns zero for now, which means the feature is disabled. We will |
| * enable it once all the infrastructure is there. |
| */ |
| static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) |
| { |
| return 0; |
| } |
| #else |
| static inline void free_huge_page_vmemmap(struct hstate *h, struct page *head) |
| { |
| } |
| |
| 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 */ |