diff --git a/ipc/util.c b/ipc/util.c
index 8626219..23151ef 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -68,7 +68,8 @@
 void __init ipc_init_ids(struct ipc_ids* ids, int size)
 {
 	int i;
-	sema_init(&ids->sem,1);
+
+	mutex_init(&ids->mutex);
 
 	if(size > IPCMNI)
 		size = IPCMNI;
@@ -138,7 +139,7 @@
  *	@ids: Identifier set
  *	@key: The key to find
  *	
- *	Requires ipc_ids.sem locked.
+ *	Requires ipc_ids.mutex locked.
  *	Returns the identifier if found or -1 if not.
  */
  
@@ -150,7 +151,7 @@
 
 	/*
 	 * rcu_dereference() is not needed here
-	 * since ipc_ids.sem is held
+	 * since ipc_ids.mutex is held
 	 */
 	for (id = 0; id <= max_id; id++) {
 		p = ids->entries->p[id];
@@ -163,7 +164,7 @@
 }
 
 /*
- * Requires ipc_ids.sem locked
+ * Requires ipc_ids.mutex locked
  */
 static int grow_ary(struct ipc_ids* ids, int newsize)
 {
@@ -210,7 +211,7 @@
  *	is returned. The list is returned in a locked state on success.
  *	On failure the list is not locked and -1 is returned.
  *
- *	Called with ipc_ids.sem held.
+ *	Called with ipc_ids.mutex held.
  */
  
 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
@@ -221,7 +222,7 @@
 
 	/*
 	 * rcu_dereference()() is not needed here since
-	 * ipc_ids.sem is held
+	 * ipc_ids.mutex is held
 	 */
 	for (id = 0; id < size; id++) {
 		if(ids->entries->p[id] == NULL)
@@ -257,7 +258,7 @@
  *	fed an invalid identifier. The entry is removed and internal
  *	variables recomputed. The object associated with the identifier
  *	is returned.
- *	ipc_ids.sem and the spinlock for this ID is hold before this function
+ *	ipc_ids.mutex and the spinlock for this ID is hold before this function
  *	is called, and remain locked on the exit.
  */
  
@@ -270,7 +271,7 @@
 
 	/* 
 	 * do not need a rcu_dereference()() here to force ordering
-	 * on Alpha, since the ipc_ids.sem is held.
+	 * on Alpha, since the ipc_ids.mutex is held.
 	 */	
 	p = ids->entries->p[lid];
 	ids->entries->p[lid] = NULL;
@@ -530,13 +531,13 @@
 
 /*
  * So far only shm_get_stat() calls ipc_get() via shm_get(), so ipc_get()
- * is called with shm_ids.sem locked.  Since grow_ary() is also called with
- * shm_ids.sem down(for Shared Memory), there is no need to add read 
+ * is called with shm_ids.mutex locked.  Since grow_ary() is also called with
+ * shm_ids.mutex down(for Shared Memory), there is no need to add read
  * barriers here to gurantee the writes in grow_ary() are seen in order 
  * here (for Alpha).
  *
- * However ipc_get() itself does not necessary require ipc_ids.sem down. So
- * if in the future ipc_get() is used by other places without ipc_ids.sem
+ * However ipc_get() itself does not necessary require ipc_ids.mutex down. So
+ * if in the future ipc_get() is used by other places without ipc_ids.mutex
  * down, then ipc_get() needs read memery barriers as ipc_lock() does.
  */
 struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id)
@@ -667,7 +668,7 @@
 	 * Take the lock - this will be released by the corresponding
 	 * call to stop().
 	 */
-	down(&iface->ids->sem);
+	mutex_lock(&iface->ids->mutex);
 
 	/* pos < 0 is invalid */
 	if (*pos < 0)
@@ -697,7 +698,7 @@
 		ipc_unlock(ipc);
 
 	/* Release the lock we took in start() */
-	up(&iface->ids->sem);
+	mutex_unlock(&iface->ids->mutex);
 }
 
 static int sysvipc_proc_show(struct seq_file *s, void *it)