5cd2b459d3
Use WARN() instead of a printk+WARN_ON() pair; this way the message becomes part of the warning section for better reporting/collection. In addition, one of the if() clauses collapes into the WARN() entirely now. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
|
|
* lib/plist.c
|
|
*
|
|
* Descending-priority-sorted double-linked list
|
|
*
|
|
* (C) 2002-2003 Intel Corp
|
|
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>.
|
|
*
|
|
* 2001-2005 (c) MontaVista Software, Inc.
|
|
* Daniel Walker <dwalker@mvista.com>
|
|
*
|
|
* (C) 2005 Thomas Gleixner <tglx@linutronix.de>
|
|
*
|
|
* Simplifications of the original code by
|
|
* Oleg Nesterov <oleg@tv-sign.ru>
|
|
*
|
|
* Licensed under the FSF's GNU Public License v2 or later.
|
|
*
|
|
* Based on simple lists (include/linux/list.h).
|
|
*
|
|
* This file contains the add / del functions which are considered to
|
|
* be too large to inline. See include/linux/plist.h for further
|
|
* information.
|
|
*/
|
|
|
|
#include <linux/plist.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#ifdef CONFIG_DEBUG_PI_LIST
|
|
|
|
static void plist_check_prev_next(struct list_head *t, struct list_head *p,
|
|
struct list_head *n)
|
|
{
|
|
WARN(n->prev != p || p->next != n,
|
|
"top: %p, n: %p, p: %p\n"
|
|
"prev: %p, n: %p, p: %p\n"
|
|
"next: %p, n: %p, p: %p\n",
|
|
t, t->next, t->prev,
|
|
p, p->next, p->prev,
|
|
n, n->next, n->prev);
|
|
}
|
|
|
|
static void plist_check_list(struct list_head *top)
|
|
{
|
|
struct list_head *prev = top, *next = top->next;
|
|
|
|
plist_check_prev_next(top, prev, next);
|
|
while (next != top) {
|
|
prev = next;
|
|
next = prev->next;
|
|
plist_check_prev_next(top, prev, next);
|
|
}
|
|
}
|
|
|
|
static void plist_check_head(struct plist_head *head)
|
|
{
|
|
WARN_ON(!head->lock);
|
|
if (head->lock)
|
|
WARN_ON_SMP(!spin_is_locked(head->lock));
|
|
plist_check_list(&head->prio_list);
|
|
plist_check_list(&head->node_list);
|
|
}
|
|
|
|
#else
|
|
# define plist_check_head(h) do { } while (0)
|
|
#endif
|
|
|
|
/**
|
|
* plist_add - add @node to @head
|
|
*
|
|
* @node: &struct plist_node pointer
|
|
* @head: &struct plist_head pointer
|
|
*/
|
|
void plist_add(struct plist_node *node, struct plist_head *head)
|
|
{
|
|
struct plist_node *iter;
|
|
|
|
plist_check_head(head);
|
|
WARN_ON(!plist_node_empty(node));
|
|
|
|
list_for_each_entry(iter, &head->prio_list, plist.prio_list) {
|
|
if (node->prio < iter->prio)
|
|
goto lt_prio;
|
|
else if (node->prio == iter->prio) {
|
|
iter = list_entry(iter->plist.prio_list.next,
|
|
struct plist_node, plist.prio_list);
|
|
goto eq_prio;
|
|
}
|
|
}
|
|
|
|
lt_prio:
|
|
list_add_tail(&node->plist.prio_list, &iter->plist.prio_list);
|
|
eq_prio:
|
|
list_add_tail(&node->plist.node_list, &iter->plist.node_list);
|
|
|
|
plist_check_head(head);
|
|
}
|
|
|
|
/**
|
|
* plist_del - Remove a @node from plist.
|
|
*
|
|
* @node: &struct plist_node pointer - entry to be removed
|
|
* @head: &struct plist_head pointer - list head
|
|
*/
|
|
void plist_del(struct plist_node *node, struct plist_head *head)
|
|
{
|
|
plist_check_head(head);
|
|
|
|
if (!list_empty(&node->plist.prio_list)) {
|
|
struct plist_node *next = plist_first(&node->plist);
|
|
|
|
list_move_tail(&next->plist.prio_list, &node->plist.prio_list);
|
|
list_del_init(&node->plist.prio_list);
|
|
}
|
|
|
|
list_del_init(&node->plist.node_list);
|
|
|
|
plist_check_head(head);
|
|
}
|