Backports v4.19.24

Backports generated by toradex backports 515a1fa55cda2b1d952872e1786857481bd54fcc
against mainline kernel tag v4.19.24

Signed-off-by: Dominik Sliwa <dominik.sliwa@toradex.com>

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 */