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| author | Davidlohr Bueso <dave@stgolabs.net> | 2017-11-17 15:31:11 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-17 16:10:04 -0800 |
| commit | 39c96a1b96a5991b1c9e79b85a8d74ef93b36026 (patch) | |
| tree | 5bd92209fad8d1a35f9a7720829204862ad29723 | |
| parent | b8fd99838435f9b420c3e848192bd43abc648b7f (diff) | |
| download | lwn-39c96a1b96a5991b1c9e79b85a8d74ef93b36026.tar.gz lwn-39c96a1b96a5991b1c9e79b85a8d74ef93b36026.zip | |
sysvipc: duplicate lock comments wrt ipc_addid()
The comment in msgqueues when using ipc_addid() is quite useful imo.
Duplicate it for shm and semaphores.
Link: http://lkml.kernel.org/r/20170831172049.14576-3-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | ipc/sem.c | 1 | ||||
| -rw-r--r-- | ipc/shm.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index b2698ebdcb31..28a5c9f0be87 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -515,6 +515,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params) sma->sem_nsems = nsems; sma->sem_ctime = ktime_get_real_seconds(); + /* ipc_addid() locks sma upon success. */ retval = ipc_addid(&sem_ids(ns), &sma->sem_perm, ns->sc_semmni); if (retval < 0) { call_rcu(&sma->sem_perm.rcu, sem_rcu_free); diff --git a/ipc/shm.c b/ipc/shm.c index bd652755d32c..378c929194ce 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -601,6 +601,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params) shp->shm_file = file; shp->shm_creator = current; + /* ipc_addid() locks shp upon success. */ error = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni); if (error < 0) goto no_id; |