]) # LC_KIOCB_KI_LEFT
#
+# LC_INIT_LIST_HEAD_RCU
+#
+# 3.12 added INIT_LIST_HEAD_RCU in commit 2a855b644c310d5db5
+# which is unfortunately an inline function and not a macro
+# that can be tested directly, so it needs a configure check.
+#
+AC_DEFUN([LC_INIT_LIST_HEAD_RCU], [
+LB_CHECK_COMPILE([if 'INIT_LIST_HEAD_RCU' exists],
+init_list_head_rcu, [
+ #include <linux/list.h>
+ #include <linux/rculist.h>
+],[
+ struct list_head list;
+ INIT_LIST_HEAD_RCU(&list);
+],[
+ AC_DEFINE(HAVE_INIT_LIST_HEAD_RCU, 1,
+ [INIT_LIST_HEAD_RCU exists])
+])
+]) # LC_INIT_LIST_HEAD_RCU
+
+#
# LC_VFS_RENAME_5ARGS
#
# 3.13 has vfs_rename with 5 args
LC_OLDSIZE_TRUNCATE_PAGECACHE
LC_PTR_ERR_OR_ZERO_MISSING
LC_KIOCB_KI_LEFT
+ LC_INIT_LIST_HEAD_RCU
# 3.13
LC_VFS_RENAME_5ARGS
#define SLAB_DESTROY_BY_RCU 0
#endif
+#ifndef HAVE_INIT_LIST_HEAD_RCU
+static inline void INIT_LIST_HEAD_RCU(struct list_head *list)
+{
+ WRITE_ONCE(list->next, list);
+ WRITE_ONCE(list->prev, list);
+}
+#endif
+
#ifndef HAVE_DQUOT_SUSPEND
# define ll_vfs_dq_init vfs_dq_init
# define ll_vfs_dq_drop vfs_dq_drop