[PATCH][2.5] Single linked lists for Linux, overly complicated but working

From: Lightweight Patch Manager (patch@luckynet.dynu.com)
Date: Thu Sep 26 2002 - 11:00:28 EST


This is an overly complicated version, I guess I'll have a better one
once I've got my noodles in. Wait an hour, I'll be back.

And BTW, I got the luckynet address fixed, you can send me again...

--- /dev/null Wed Dec 31 17:00:00 1969
+++ slist-2.5/include/linux/slist.h Thu Sep 26 09:57:25 2002
@@ -0,0 +1,139 @@
+#ifdef __KERNEL__
+#ifndef _LINUX_SLIST_H
+#define _LINUX_SLIST_H
+
+#include <asm/processor.h>
+
+/*
+ * Type-safe single linked list helper-functions.
+ * (originally taken from list.h)
+ *
+ * Thomas 'Dent' Mirlacher, Daniel Phillips,
+ * Andreas Bogk, Thunder from the hill
+ */
+
+#define INIT_SLIST_HEAD(name) \
+ (name->next = name)
+
+#define SLIST_HEAD_INIT(name) \
+ name
+
+#define SLIST_HEAD(type,name) \
+ typeof(type) name = INIT_SLIST_HEAD(name)
+
+/**
+ * slist_add_front - add a new entry at the first slot, moving the old head
+ * to the second slot
+ * @new: new entry to be added
+ * @head: head of the single linked list
+ *
+ * Insert a new entry before the specified head.
+ * This is good for implementing stacks.
+ */
+
+#define slist_add_front(_new, _head) \
+do { \
+ (_new)->next = (_head); \
+ (_head) = (_new); \
+} while (0)
+
+/**
+ * slist_add - add a new entry
+ * @new: new entry to be added
+ * @head: head of the single linked list
+ *
+ * Insert a new entry before the specified head.
+ * This is good for implementing stacks.
+ *
+ * Careful: if you do this concurrently, _head
+ * might get into nirvana...
+ */
+#define slist_add(_new, _head) \
+do { \
+ (_new)->next = (_head)->next; \
+ (_head)->next = (_new); \
+ (_new) = (_head); \
+} while (0)
+
+/**
+ * slist_del - remove an entry from list
+ * @head: head to remove it from
+ * @entry: entry to be removed
+ */
+#define slist_del(_entry) \
+({ \
+ typeof(_entry) _head = \
+ kmalloc(sizeof(_entry), GFP_KERNEL), _free; \
+ if (_head) { \
+ memcpy(_head, (_entry), sizeof(_entry)); \
+ _free = (_entry); \
+ (_entry) = (_entry)->next; \
+ kfree(_free); \
+ _head->next = NULL; \
+ _head; \
+ } else \
+ NULL; \
+})
+
+/**
+ * slist_del_init - remove an entry from list and initialize it
+ * @head: head to remove it from
+ * @entry: entry to be removed
+ */
+#define slist_del_init(_entry) \
+({ \
+ typeof(_entry) _head = \
+ kmalloc(sizeof(_entry), GFP_KERNEL), _free; \
+ if (_head) { \
+ memcpy(_head, (_entry), sizeof(_entry)); \
+ _free = (_entry); \
+ (_entry) = (_entry)->next; \
+ kfree(_free); \
+ _head->next = _head; \
+ _head; \
+ } else \
+ NULL; \
+})
+
+/**
+ * slist_del_single - untag a list from an entry
+ * @list: list entry to be untagged
+ */
+#define slist_del_single(_list) \
+ ((_list)->next = NULL)
+
+/**
+ * slist_pop - pop out list entry
+ * @list: entry to be popped out
+ *
+ * Pop out an entry from a list.
+ */
+#define slist_pop(_list) ({ \
+ typeof(_list) _NODE_ = _list; \
+ if (_list) { \
+ (_list) = (_list)->next; \
+ _NODE_->next = NULL; \
+ } \
+ _NODE_; })
+
+/**
+ * slist_for_each - iterate over a list
+ * @pos: the pointer to use as a loop counter.
+ * @head: the head for your list (this is also the first entry).
+ */
+#define slist_for_each(pos, head) \
+ for (pos = head; pos && ({ prefetch(pos->next); 1; }); \
+ pos = pos->next)
+
+/**
+ * slist_for_each_del - iterate over a list, popping off entries
+ * @pos: the pointer to use as a loop counter.
+ * @head: the head for your list (this is also the first entry).
+ */
+#define slist_for_each_del(pos, head) \
+ for (pos = slist_pop(head); pos && \
+ ({ prefetch(pos->next); 1; }); \
+ pos = slist_pop(head))
+
+#endif /* _LINUX_SLIST_H */
+#endif /* __KERNEL__ */

-- 
Lightweight Patch Manager, without pine.
If you have any objections (apart from who I am), tell me

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