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#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 */
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