1 files changed, 26 insertions, 0 deletions
diff --git a/backport-include/linux/err.h b/backport-include/linux/err.h
new file mode 100644
index 0000000..f62e3bf
--- /dev/null
+++ b/backport-include/linux/err.h
@@ -0,0 +1,26 @@
+#ifndef __BACKPORT_LINUX_ERR_H
+#define __BACKPORT_LINUX_ERR_H
+#include_next <linux/err.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+static inline int __must_check PTR_RET(const void *ptr)
+{
+	if (IS_ERR(ptr))
+		return PTR_ERR(ptr);
+	else
+		return 0;
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+/* mask IS_ERR_OR_NULL as debian squeeze also backports this */
+#define IS_ERR_OR_NULL LINUX_BACKPORT(IS_ERR_OR_NULL)
+
+static inline long __must_check IS_ERR_OR_NULL(const void *ptr)
+{
+	return !ptr || IS_ERR_VALUE((unsigned long)ptr);
+}
+#endif
+
+#endif /* __BACKPORT_LINUX_ERR_H */