#ifndef __BP_PAGE_REF_H
#define __BP_PAGE_REF_H
#include <linux/version.h>
#if LINUX_VERSION_IS_GEQ(4,6,0)
#include_next <linux/page_ref.h>
#else
static inline void page_ref_inc(struct page *page)
{
	atomic_inc(&page->_count);
}

#if !LINUX_VERSION_IN_RANGE(4,4,216, 4,5,0)
static inline int page_ref_count(struct page *page)
{
	return atomic_read(&page->_count);
}
#endif /* 4.4.216 <= x < 4.5 */

static inline int page_ref_sub_and_test(struct page *page, int nr)
{
	return atomic_sub_and_test(nr, &page->_count);
}
#endif

#endif /* __BP_PAGE_REF_H */