90 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _LINUX_MM_PAGE_IDLE_H3#define _LINUX_MM_PAGE_IDLE_H4 5#include <linux/bitops.h>6#include <linux/page-flags.h>7#include <linux/page_ext.h>8 9#if defined(CONFIG_PAGE_IDLE_FLAG) && !defined(CONFIG_64BIT)10/*11 * If there is not enough space to store Idle and Young bits in page flags, use12 * page ext flags instead.13 */14static inline bool folio_test_young(const struct folio *folio)15{16 struct page_ext *page_ext = page_ext_get(&folio->page);17 bool page_young;18 19 if (unlikely(!page_ext))20 return false;21 22 page_young = test_bit(PAGE_EXT_YOUNG, &page_ext->flags);23 page_ext_put(page_ext);24 25 return page_young;26}27 28static inline void folio_set_young(struct folio *folio)29{30 struct page_ext *page_ext = page_ext_get(&folio->page);31 32 if (unlikely(!page_ext))33 return;34 35 set_bit(PAGE_EXT_YOUNG, &page_ext->flags);36 page_ext_put(page_ext);37}38 39static inline bool folio_test_clear_young(struct folio *folio)40{41 struct page_ext *page_ext = page_ext_get(&folio->page);42 bool page_young;43 44 if (unlikely(!page_ext))45 return false;46 47 page_young = test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);48 page_ext_put(page_ext);49 50 return page_young;51}52 53static inline bool folio_test_idle(const struct folio *folio)54{55 struct page_ext *page_ext = page_ext_get(&folio->page);56 bool page_idle;57 58 if (unlikely(!page_ext))59 return false;60 61 page_idle = test_bit(PAGE_EXT_IDLE, &page_ext->flags);62 page_ext_put(page_ext);63 64 return page_idle;65}66 67static inline void folio_set_idle(struct folio *folio)68{69 struct page_ext *page_ext = page_ext_get(&folio->page);70 71 if (unlikely(!page_ext))72 return;73 74 set_bit(PAGE_EXT_IDLE, &page_ext->flags);75 page_ext_put(page_ext);76}77 78static inline void folio_clear_idle(struct folio *folio)79{80 struct page_ext *page_ext = page_ext_get(&folio->page);81 82 if (unlikely(!page_ext))83 return;84 85 clear_bit(PAGE_EXT_IDLE, &page_ext->flags);86 page_ext_put(page_ext);87}88#endif /* CONFIG_PAGE_IDLE_FLAG && !64BIT */89#endif /* _LINUX_MM_PAGE_IDLE_H */90