datapath: Rename linux-2.6 and compat-2.6 directories.

[sliver-openvswitch.git] / datapath / linux / compat / include / linux / err.h

diff --git a/datapath/linux/compat/include/linux/err.h b/datapath/linux/compat/include/linux/err.h
new file mode 100644 (file)
index 0000000..50faf2a
--- /dev/null
+++ b/datapath/linux/compat/include/linux/err.h
@@ -0,0 +1,21 @@
+#ifndef __LINUX_ERR_WRAPPER_H
+#define __LINUX_ERR_WRAPPER_H 1
+
+#include_next <linux/err.h>
+
+#ifndef HAVE_ERR_CAST
+/**
+ * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
+ * @ptr: The pointer to cast.
+ *
+ * Explicitly cast an error-valued pointer to another pointer type in such a
+ * way as to make it clear that's what's going on.
+ */
+static inline void *ERR_CAST(const void *ptr)
+{
+       /* cast away the const */
+       return (void *) ptr;
+}
+#endif /* HAVE_ERR_CAST */
+
+#endif