/* SPDX-License-Identifier: GPL-2.0-only */
+static inline struct mutex_waiter *
+__ww_waiter_first(struct mutex *lock)
+{
+ struct mutex_waiter *w;
+
+ w = list_first_entry(&lock->wait_list, struct mutex_waiter, list);
+ if (list_entry_is_head(w, &lock->wait_list, list))
+ return NULL;
+
+ return w;
+}
+
+static inline struct mutex_waiter *
+__ww_waiter_next(struct mutex *lock, struct mutex_waiter *w)
+{
+ w = list_next_entry(w, list);
+ if (list_entry_is_head(w, &lock->wait_list, list))
+ return NULL;
+
+ return w;
+}
+
+static inline struct mutex_waiter *
+__ww_waiter_prev(struct mutex *lock, struct mutex_waiter *w)
+{
+ w = list_prev_entry(w, list);
+ if (list_entry_is_head(w, &lock->wait_list, list))
+ return NULL;
+
+ return w;
+}
+
+static inline struct mutex_waiter *
+__ww_waiter_last(struct mutex *lock)
+{
+ struct mutex_waiter *w;
+
+ w = list_last_entry(&lock->wait_list, struct mutex_waiter, list);
+ if (list_entry_is_head(w, &lock->wait_list, list))
+ return NULL;
+
+ return w;
+}
+
/*
* Wait-Die:
* The newer transactions are killed when:
lockdep_assert_held(&lock->wait_lock);
- list_for_each_entry(cur, &lock->wait_list, list) {
+ for (cur = __ww_waiter_first(lock); cur;
+ cur = __ww_waiter_next(lock, cur)) {
+
if (!cur->ww_ctx)
continue;
* If there is a waiter in front of us that has a context, then its
* stamp is earlier than ours and we must kill ourself.
*/
- cur = waiter;
- list_for_each_entry_continue_reverse(cur, &lock->wait_list, list) {
+ for (cur = __ww_waiter_prev(lock, waiter); cur;
+ cur = __ww_waiter_prev(lock, cur)) {
+
if (!cur->ww_ctx)
continue;
* may wound the lock holder.
*/
pos = &lock->wait_list;
- list_for_each_entry_reverse(cur, &lock->wait_list, list) {
+ for (cur = __ww_waiter_last(lock); cur;
+ cur = __ww_waiter_prev(lock, cur)) {
+
if (!cur->ww_ctx)
continue;