+# LC_HAVE_USER_NAMESPACE_ARG
+#
+# kernel 5.12 commit 549c7297717c32ee53f156cd949e055e601f67bb
+# fs: make helpers idmap mount aware
+# Extend some inode methods with an additional user namespace argument.
+#
+AC_DEFUN([LC_HAVE_USER_NAMESPACE_ARG], [
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_CHECK_COMPILE([if 'inode_operations' members have user namespace argument],
+user_namespace_argument, [
+ #include <linux/fs.h>
+],[
+ ((struct inode_operations *)1)->getattr((struct user_namespace *)NULL,
+ NULL, NULL, 0, 0);
+],[
+ AC_DEFINE(HAVE_USER_NAMESPACE_ARG, 1,
+ ['inode_operations' members have user namespace argument])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+]) # LC_HAVE_USER_NAMESPACE_ARG
+
+AC_DEFUN([LC_PROG_LINUX_SRC], [])
+AC_DEFUN([LC_PROG_LINUX_RESULTS], [])
+
+#