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| author | Davidlohr Bueso <davidlohr.bueso@hp.com> | 2013-09-11 14:26:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:59:42 -0700 |
| commit | d9a605e40b1376eb02b067d7690580255a0df68f (patch) | |
| tree | b21254f7172ae8db6faffd9b7941d579fa421478 /ipc/msg.c | |
| parent | c2c737a0461e61a34676bd0bd1bc1a70a1b4e396 (diff) | |
| download | lwn-d9a605e40b1376eb02b067d7690580255a0df68f.tar.gz lwn-d9a605e40b1376eb02b067d7690580255a0df68f.zip | |
ipc: rename ids->rw_mutex
Since in some situations the lock can be shared for readers, we shouldn't
be calling it a mutex, rename it to rwsem.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/msg.c')
| -rw-r--r-- | ipc/msg.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index b65fdf1a09dd..8203e71bcfbc 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -172,7 +172,7 @@ static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) * @ns: namespace * @params: ptr to the structure that contains the key and msgflg * - * Called with msg_ids.rw_mutex held (writer) + * Called with msg_ids.rwsem held (writer) */ static int newque(struct ipc_namespace *ns, struct ipc_params *params) { @@ -259,8 +259,8 @@ static void expunge_all(struct msg_queue *msq, int res) * removes the message queue from message queue ID IDR, and cleans up all the * messages associated with this queue. * - * msg_ids.rw_mutex (writer) and the spinlock for this message queue are held - * before freeque() is called. msg_ids.rw_mutex remains locked on exit. + * msg_ids.rwsem (writer) and the spinlock for this message queue are held + * before freeque() is called. msg_ids.rwsem remains locked on exit. */ static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) { @@ -282,7 +282,7 @@ static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) } /* - * Called with msg_ids.rw_mutex and ipcp locked. + * Called with msg_ids.rwsem and ipcp locked. */ static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg) { @@ -386,9 +386,9 @@ copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) } /* - * This function handles some msgctl commands which require the rw_mutex + * This function handles some msgctl commands which require the rwsem * to be held in write mode. - * NOTE: no locks must be held, the rw_mutex is taken inside this function. + * NOTE: no locks must be held, the rwsem is taken inside this function. */ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, struct msqid_ds __user *buf, int version) @@ -403,7 +403,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, return -EFAULT; } - down_write(&msg_ids(ns).rw_mutex); + down_write(&msg_ids(ns).rwsem); rcu_read_lock(); ipcp = ipcctl_pre_down_nolock(ns, &msg_ids(ns), msqid, cmd, @@ -459,7 +459,7 @@ out_unlock0: out_unlock1: rcu_read_unlock(); out_up: - up_write(&msg_ids(ns).rw_mutex); + up_write(&msg_ids(ns).rwsem); return err; } @@ -494,7 +494,7 @@ static int msgctl_nolock(struct ipc_namespace *ns, int msqid, msginfo.msgmnb = ns->msg_ctlmnb; msginfo.msgssz = MSGSSZ; msginfo.msgseg = MSGSEG; - down_read(&msg_ids(ns).rw_mutex); + down_read(&msg_ids(ns).rwsem); if (cmd == MSG_INFO) { msginfo.msgpool = msg_ids(ns).in_use; msginfo.msgmap = atomic_read(&ns->msg_hdrs); @@ -505,7 +505,7 @@ static int msgctl_nolock(struct ipc_namespace *ns, int msqid, msginfo.msgtql = MSGTQL; } max_id = ipc_get_maxid(&msg_ids(ns)); - up_read(&msg_ids(ns).rw_mutex); + up_read(&msg_ids(ns).rwsem); if (copy_to_user(buf, &msginfo, sizeof(struct msginfo))) return -EFAULT; return (max_id < 0) ? 0 : max_id; |