diff options
Diffstat (limited to 'backport-include/linux/page_ref.h')
-rw-r--r-- | backport-include/linux/page_ref.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/backport-include/linux/page_ref.h b/backport-include/linux/page_ref.h new file mode 100644 index 0000000..e45734e --- /dev/null +++ b/backport-include/linux/page_ref.h @@ -0,0 +1,23 @@ +#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); +} + +static inline int page_ref_count(struct page *page) +{ + return atomic_read(&page->_count); +} + +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 */ |