From: Davidlohr Bueso Date: Mon, 8 Jul 2013 23:01:10 +0000 (-0700) Subject: ipc: introduce ipc object locking helpers X-Git-Tag: firefly_0821_release~176^2~5754^2~39 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1ca7003ab41152d673d9e359632283d05294f3d6;p=firefly-linux-kernel-4.4.55.git ipc: introduce ipc object locking helpers Simple helpers around the (kern_ipc_perm *)->lock spinlock. Signed-off-by: Davidlohr Bueso Cc: Andi Kleen Cc: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/ipc/util.h b/ipc/util.h index 2b0bdd5d92ce..da65e8afb8f4 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -159,23 +159,33 @@ static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid) return uid / SEQ_MULTIPLIER != ipcp->seq; } -static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm) +static inline void ipc_lock_object(struct kern_ipc_perm *perm) { - rcu_read_lock(); spin_lock(&perm->lock); } -static inline void ipc_unlock(struct kern_ipc_perm *perm) +static inline void ipc_unlock_object(struct kern_ipc_perm *perm) { spin_unlock(&perm->lock); - rcu_read_unlock(); } -static inline void ipc_lock_object(struct kern_ipc_perm *perm) +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(); spin_lock(&perm->lock); } +static inline void ipc_unlock(struct kern_ipc_perm *perm) +{ + spin_unlock(&perm->lock); + rcu_read_unlock(); +} + 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,