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#ifndef _LINUX_MM_PAGE_IDLE_H
#define _LINUX_MM_PAGE_IDLE_H
#include <linux/bitops.h>
#include <linux/page-flags.h>
#include <linux/page_ext.h>
#ifdef CONFIG_IDLE_PAGE_TRACKING
#ifdef CONFIG_64BIT
static inline bool page_is_young(struct page *page)
{
return PageYoung(page);
}
static inline void set_page_young(struct page *page)
{
SetPageYoung(page);
}
static inline bool test_and_clear_page_young(struct page *page)
{
return TestClearPageYoung(page);
}
static inline bool page_is_idle(struct page *page)
{
return PageIdle(page);
}
static inline void set_page_idle(struct page *page)
{
SetPageIdle(page);
}
static inline void clear_page_idle(struct page *page)
{
ClearPageIdle(page);
}
#else /* !CONFIG_64BIT */
/*
* If there is not enough space to store Idle and Young bits in page flags, use
* page ext flags instead.
*/
extern struct page_ext_operations page_idle_ops;
static inline bool page_is_young(struct page *page)
{
return test_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
}
static inline void set_page_young(struct page *page)
{
set_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
}
static inline bool test_and_clear_page_young(struct page *page)
{
return test_and_clear_bit(PAGE_EXT_YOUNG,
&lookup_page_ext(page)->flags);
}
static inline bool page_is_idle(struct page *page)
{
return test_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
}
static inline void set_page_idle(struct page *page)
{
set_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
}
static inline void clear_page_idle(struct page *page)
{
clear_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
}
#endif /* CONFIG_64BIT */
#else /* !CONFIG_IDLE_PAGE_TRACKING */
static inline bool page_is_young(struct page *page)
{
return false;
}
static inline void set_page_young(struct page *page)
{
}
static inline bool test_and_clear_page_young(struct page *page)
{
return false;
}
static inline bool page_is_idle(struct page *page)
{
return false;
}
static inline void set_page_idle(struct page *page)
{
}
static inline void clear_page_idle(struct page *page)
{
}
#endif /* CONFIG_IDLE_PAGE_TRACKING */
#endif /* _LINUX_MM_PAGE_IDLE_H */