ipc: introduce ipc object locking helpers
Simple helpers around the (kern_ipc_perm *)->lock spinlock.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/ipc/util.h b/ipc/util.h
index 2b0bdd5..da65e8a 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -159,6 +159,21 @@
return uid / SEQ_MULTIPLIER != ipcp->seq;
}
+static inline void ipc_lock_object(struct kern_ipc_perm *perm)
+{
+ spin_lock(&perm->lock);
+}
+
+static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
+{
+ spin_unlock(&perm->lock);
+}
+
+static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)
+{
+ assert_spin_locked(&perm->lock);
+}
+
static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
{
rcu_read_lock();
@@ -171,11 +186,6 @@
rcu_read_unlock();
}
-static inline void ipc_lock_object(struct kern_ipc_perm *perm)
-{
- spin_lock(&perm->lock);
-}
-
struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id);
struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
