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Directory :  /usr/src/linux-headers-4.4.0-109/include/linux/

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Current File : //usr/src/linux-headers-4.4.0-109/include/linux/page_idle.h
#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 */

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