diff --git a/include/linux/err.h b/include/linux/err.h
new file mode 100644
index 0000000..17c55df
--- /dev/null
+++ b/include/linux/err.h
@@ -0,0 +1,31 @@
+#ifndef _LINUX_ERR_H
+#define _LINUX_ERR_H
+
+#include <linux/compiler.h>
+
+#include <asm/errno.h>
+
+/*
+ * Kernel pointers have redundant information, so we can use a
+ * scheme where we can return either an error code or a dentry
+ * pointer with the same return value.
+ *
+ * This should be a per-architecture thing, to allow different
+ * error and pointer decisions.
+ */
+static inline void *ERR_PTR(long error)
+{
+	return (void *) error;
+}
+
+static inline long PTR_ERR(const void *ptr)
+{
+	return (long) ptr;
+}
+
+static inline long IS_ERR(const void *ptr)
+{
+	return unlikely((unsigned long)ptr > (unsigned long)-1000L);
+}
+
+#endif /* _LINUX_ERR_H */