ipc: drop ipc_lock_by_ptr

After previous cleanups and optimizations, this function is no longer
heavily used and we don't have a good reason to keep it.  Update the few
remaining callers and get rid of it.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: 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>

1 files changed, 2 insertions, 1 deletions

diff --git a/ipc/namespace.c b/ipc/namespace.c
index d43d9384bb2d..59451c1e214d 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -89,7 +89,8 @@ void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
                 perm = idr_find(&ids->ipcs_idr, next_id);
                 if (perm == NULL)
                         continue;
-                ipc_lock_by_ptr(perm);
+                rcu_read_lock();
+                ipc_lock_object(perm);
                 free(ns, perm);
                 total++;
         }