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-rw-r--r--kernel/sched/wait_bit.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/kernel/sched/wait_bit.c b/kernel/sched/wait_bit.c
index 4239c78f5cd3..ed84ab245a05 100644
--- a/kernel/sched/wait_bit.c
+++ b/kernel/sched/wait_bit.c
@@ -149,6 +149,54 @@ void wake_up_bit(void *word, int bit)
}
EXPORT_SYMBOL(wake_up_bit);
+wait_queue_head_t *__var_waitqueue(void *p)
+{
+ if (BITS_PER_LONG == 64) {
+ unsigned long q = (unsigned long)p;
+
+ return bit_waitqueue((void *)(q & ~1), q & 1);
+ }
+ return bit_waitqueue(p, 0);
+}
+EXPORT_SYMBOL(__var_waitqueue);
+
+static int
+var_wake_function(struct wait_queue_entry *wq_entry, unsigned int mode,
+ int sync, void *arg)
+{
+ struct wait_bit_key *key = arg;
+ struct wait_bit_queue_entry *wbq_entry =
+ container_of(wq_entry, struct wait_bit_queue_entry, wq_entry);
+
+ if (wbq_entry->key.flags != key->flags ||
+ wbq_entry->key.bit_nr != key->bit_nr)
+ return 0;
+
+ return autoremove_wake_function(wq_entry, mode, sync, key);
+}
+
+void init_wait_var_entry(struct wait_bit_queue_entry *wbq_entry, void *var, int flags)
+{
+ *wbq_entry = (struct wait_bit_queue_entry){
+ .key = {
+ .flags = (var),
+ .bit_nr = -1,
+ },
+ .wq_entry = {
+ .private = current,
+ .func = var_wake_function,
+ .entry = LIST_HEAD_INIT(wbq_entry->wq_entry.entry),
+ },
+ };
+}
+EXPORT_SYMBOL(init_wait_var_entry);
+
+void wake_up_var(void *var)
+{
+ __wake_up_bit(__var_waitqueue(var), var, -1);
+}
+EXPORT_SYMBOL(wake_up_var);
+
/*
* Manipulate the atomic_t address to produce a better bit waitqueue table hash
* index (we're keying off bit -1, but that would produce a horrible hash