Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 186 insertions, 0 deletions

diff --git a/include/linux/llist.h b/include/linux/llist.h
new file mode 100644
index 00000000..a5199f6d
--- /dev/null
+++ b/include/linux/llist.h
@@ -0,0 +1,186 @@
+#ifndef LLIST_H
+#define LLIST_H
+/*
+ * Lock-less NULL terminated single linked list
+ *
+ * If there are multiple producers and multiple consumers, llist_add
+ * can be used in producers and llist_del_all can be used in
+ * consumers.  They can work simultaneously without lock.  But
+ * llist_del_first can not be used here.  Because llist_del_first
+ * depends on list->first->next does not changed if list->first is not
+ * changed during its operation, but llist_del_first, llist_add,
+ * llist_add (or llist_del_all, llist_add, llist_add) sequence in
+ * another consumer may violate that.
+ *
+ * If there are multiple producers and one consumer, llist_add can be
+ * used in producers and llist_del_all or llist_del_first can be used
+ * in the consumer.
+ *
+ * This can be summarized as follow:
+ *
+ *           |   add    | del_first |  del_all
+ * add       |    -     |     -     |     -
+ * del_first |          |     L     |     L
+ * del_all   |          |           |     -
+ *
+ * Where "-" stands for no lock is needed, while "L" stands for lock
+ * is needed.
+ *
+ * The list entries deleted via llist_del_all can be traversed with
+ * traversing function such as llist_for_each etc.  But the list
+ * entries can not be traversed safely before deleted from the list.
+ * The order of deleted entries is from the newest to the oldest added
+ * one.  If you want to traverse from the oldest to the newest, you
+ * must reverse the order by yourself before traversing.
+ *
+ * The basic atomic operation of this list is cmpxchg on long.  On
+ * architectures that don't have NMI-safe cmpxchg implementation, the
+ * list can NOT be used in NMI handlers.  So code that uses the list in
+ * an NMI handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
+ *
+ * Copyright 2010,2011 Intel Corp.
+ *   Author: Huang Ying <ying.huang@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <asm/cmpxchg.h>
+
+struct llist_head {
+	struct llist_node *first;
+};
+
+struct llist_node {
+	struct llist_node *next;
+};
+
+#define LLIST_HEAD_INIT(name)	{ NULL }
+#define LLIST_HEAD(name)	struct llist_head name = LLIST_HEAD_INIT(name)
+
+/**
+ * init_llist_head - initialize lock-less list head
+ * @head:	the head for your lock-less list
+ */
+static inline void init_llist_head(struct llist_head *list)
+{
+	list->first = NULL;
+}
+
+/**
+ * llist_entry - get the struct of this entry
+ * @ptr:	the &struct llist_node pointer.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the llist_node within the struct.
+ */
+#define llist_entry(ptr, type, member)		\
+	container_of(ptr, type, member)
+
+/**
+ * llist_for_each - iterate over some deleted entries of a lock-less list
+ * @pos:	the &struct llist_node to use as a loop cursor
+ * @node:	the first entry of deleted list entries
+ *
+ * In general, some entries of the lock-less list can be traversed
+ * safely only after being deleted from list, so start with an entry
+ * instead of list head.
+ *
+ * If being used on entries deleted from lock-less list directly, the
+ * traverse order is from the newest to the oldest added entry.  If
+ * you want to traverse from the oldest to the newest, you must
+ * reverse the order by yourself before traversing.
+ */
+#define llist_for_each(pos, node)			\
+	for ((pos) = (node); pos; (pos) = (pos)->next)
+
+/**
+ * llist_for_each_entry - iterate over some deleted entries of lock-less list of given type
+ * @pos:	the type * to use as a loop cursor.
+ * @node:	the fist entry of deleted list entries.
+ * @member:	the name of the llist_node with the struct.
+ *
+ * In general, some entries of the lock-less list can be traversed
+ * safely only after being removed from list, so start with an entry
+ * instead of list head.
+ *
+ * If being used on entries deleted from lock-less list directly, the
+ * traverse order is from the newest to the oldest added entry.  If
+ * you want to traverse from the oldest to the newest, you must
+ * reverse the order by yourself before traversing.
+ */
+#define llist_for_each_entry(pos, node, member)				\
+	for ((pos) = llist_entry((node), typeof(*(pos)), member);	\
+	     &(pos)->member != NULL;					\
+	     (pos) = llist_entry((pos)->member.next, typeof(*(pos)), member))
+
+/**
+ * llist_empty - tests whether a lock-less list is empty
+ * @head:	the list to test
+ *
+ * Not guaranteed to be accurate or up to date.  Just a quick way to
+ * test whether the list is empty without deleting something from the
+ * list.
+ */
+static inline bool llist_empty(const struct llist_head *head)
+{
+	return ACCESS_ONCE(head->first) == NULL;
+}
+
+static inline struct llist_node *llist_next(struct llist_node *node)
+{
+	return node->next;
+}
+
+/**
+ * llist_add - add a new entry
+ * @new:	new entry to be added
+ * @head:	the head for your lock-less list
+ *
+ * Returns true if the list was empty prior to adding this entry.
+ */
+static inline bool llist_add(struct llist_node *new, struct llist_head *head)
+{
+	struct llist_node *entry, *old_entry;
+
+	entry = head->first;
+	for (;;) {
+		old_entry = entry;
+		new->next = entry;
+		entry = cmpxchg(&head->first, old_entry, new);
+		if (entry == old_entry)
+			break;
+	}
+
+	return old_entry == NULL;
+}
+
+/**
+ * llist_del_all - delete all entries from lock-less list
+ * @head:	the head of lock-less list to delete all entries
+ *
+ * If list is empty, return NULL, otherwise, delete all entries and
+ * return the pointer to the first entry.  The order of entries
+ * deleted is from the newest to the oldest added one.
+ */
+static inline struct llist_node *llist_del_all(struct llist_head *head)
+{
+	return xchg(&head->first, NULL);
+}
+
+extern bool llist_add_batch(struct llist_node *new_first,
+			    struct llist_node *new_last,
+			    struct llist_head *head);
+extern struct llist_node *llist_del_first(struct llist_head *head);
+
+#endif /* LLIST_H */