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-rw-r--r--kernel/futex.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index ebb48d6d1a87..421fb5e42a10 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -276,6 +276,25 @@ void put_futex_key(int fshared, union futex_key *key)
276 drop_futex_key_refs(key); 276 drop_futex_key_refs(key);
277} 277}
278 278
279/**
280 * futex_top_waiter() - Return the highest priority waiter on a futex
281 * @hb: the hash bucket the futex_q's reside in
282 * @key: the futex key (to distinguish it from other futex futex_q's)
283 *
284 * Must be called with the hb lock held.
285 */
286static struct futex_q *futex_top_waiter(struct futex_hash_bucket *hb,
287 union futex_key *key)
288{
289 struct futex_q *this;
290
291 plist_for_each_entry(this, &hb->chain, list) {
292 if (match_futex(&this->key, key))
293 return this;
294 }
295 return NULL;
296}
297
279static u32 cmpxchg_futex_value_locked(u32 __user *uaddr, u32 uval, u32 newval) 298static u32 cmpxchg_futex_value_locked(u32 __user *uaddr, u32 uval, u32 newval)
280{ 299{
281 u32 curval; 300 u32 curval;