diff options
Diffstat (limited to 'ipc/util.c')
-rw-r--r-- | ipc/util.c | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/ipc/util.c b/ipc/util.c index 03b88798f71f..e72865f677a7 100644 --- a/ipc/util.c +++ b/ipc/util.c | |||
@@ -669,25 +669,6 @@ void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out) | |||
669 | out->seq = in->seq; | 669 | out->seq = in->seq; |
670 | } | 670 | } |
671 | 671 | ||
672 | /* | ||
673 | * So far only shm_get_stat() calls ipc_get() via shm_get(), so ipc_get() | ||
674 | * is called with shm_ids.mutex locked. Since grow_ary() is also called with | ||
675 | * shm_ids.mutex down(for Shared Memory), there is no need to add read | ||
676 | * barriers here to gurantee the writes in grow_ary() are seen in order | ||
677 | * here (for Alpha). | ||
678 | * | ||
679 | * However ipc_get() itself does not necessary require ipc_ids.mutex down. So | ||
680 | * if in the future ipc_get() is used by other places without ipc_ids.mutex | ||
681 | * down, then ipc_get() needs read memery barriers as ipc_lock() does. | ||
682 | */ | ||
683 | struct kern_ipc_perm *ipc_get(struct ipc_ids *ids, int id) | ||
684 | { | ||
685 | struct kern_ipc_perm *out; | ||
686 | int lid = id % SEQ_MULTIPLIER; | ||
687 | out = idr_find(&ids->ipcs_idr, lid); | ||
688 | return out; | ||
689 | } | ||
690 | |||
691 | struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id) | 672 | struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id) |
692 | { | 673 | { |
693 | struct kern_ipc_perm *out; | 674 | struct kern_ipc_perm *out; |