ipc: store ipcs into IDRs

This patch introduces ipcs storage into IDRs. The main changes are:
  . This ipc_ids structure is changed: the entries array is changed into a
    root idr structure.
  . The grow_ary() routine is removed: it is not needed anymore when adding
    an ipc structure, since we are now using the IDR facility.
  . The ipc_rmid() routine interface is changed:
       . there is no need for this routine to return the pointer passed in as
         argument: it is now declared as a void
       . since the id is now part of the kern_ipc_perm structure, no need to
         have it as an argument to the routine

Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index ee111834091..96988d1460d 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -89,6 +89,7 @@ struct kern_ipc_perm
 {
 	spinlock_t	lock;
 	int		deleted;
+	int		id;
 	key_t		key;
 	uid_t		uid;
 	gid_t		gid;