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authorNadia Derbey <Nadia.Derbey@bull.net>2007-10-18 23:40:52 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:46 -0700
commitce621f5ba52f30dd59aef4fb50276faee04ef9cf (patch)
treee0260364cf8748849d37165760db6d4e4e51ed9c /ipc
parent03f02c7657f7948ab980280c54c9366f962b1474 (diff)
downloadlinaro-lsk-ce621f5ba52f30dd59aef4fb50276faee04ef9cf.tar.gz
ipc: introduce the ipcid_to_idx macro
This is a trivial patch that changes all the (id % SEQ_MULTIPLIER) into a call to the ipcid_to_idx(id) macro. 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>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/util.c4
-rw-r--r--ipc/util.h2
2 files changed, 4 insertions, 2 deletions
diff --git a/ipc/util.c b/ipc/util.c
index 9b0c4e7753a..c51c96f2e0c 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -413,7 +413,7 @@ int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
{
- int lid = ipcp->id % SEQ_MULTIPLIER;
+ int lid = ipcid_to_idx(ipcp->id);
idr_remove(&ids->ipcs_idr, lid);
@@ -672,7 +672,7 @@ void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out)
struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id)
{
struct kern_ipc_perm *out;
- int lid = id % SEQ_MULTIPLIER;
+ int lid = ipcid_to_idx(id);
rcu_read_lock();
out = idr_find(&ids->ipcs_idr, lid);
diff --git a/ipc/util.h b/ipc/util.h
index 2a03d8cc6a0..fa7e7a07486 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -79,6 +79,8 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
#define IPC_MSG_IDS 1
#define IPC_SHM_IDS 2
+#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER)
+
/* must be called with ids->mutex acquired.*/
int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
int ipc_get_maxid(struct ipc_ids *);