lkml.org 
[lkml]   [2007]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[RFC][PATCH 3/6] Removing the ipc_get() routine
[PATCH 03/06]


This is a trivial patch that removes the ipc_get() routine: it is replaced
by a call to idr_find().


Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>

---
ipc/shm.c | 16 +++++++++++++---
ipc/util.c | 19 -------------------
ipc/util.h | 1 -
3 files changed, 13 insertions(+), 23 deletions(-)
Index: linux-2.6.23-rc2/ipc/util.h
===================================================================
--- linux-2.6.23-rc2.orig/ipc/util.h 2007-08-31 11:38:50.000000000 +0200
+++ linux-2.6.23-rc2/ipc/util.h 2007-08-31 11:59:11.000000000 +0200
@@ -103,7 +103,6 @@ void* ipc_rcu_alloc(int size);
void ipc_rcu_getref(void *ptr);
void ipc_rcu_putref(void *ptr);

-struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
void ipc_unlock(struct kern_ipc_perm* perm);
Index: linux-2.6.23-rc2/ipc/util.c
===================================================================
--- linux-2.6.23-rc2.orig/ipc/util.c 2007-08-31 11:40:03.000000000 +0200
+++ linux-2.6.23-rc2/ipc/util.c 2007-08-31 11:59:46.000000000 +0200
@@ -669,25 +669,6 @@ void ipc64_perm_to_ipc_perm (struct ipc6
out->seq = in->seq;
}

-/*
- * So far only shm_get_stat() calls ipc_get() via shm_get(), so ipc_get()
- * is called with shm_ids.mutex locked. Since grow_ary() is also called with
- * shm_ids.mutex down(for Shared Memory), there is no need to add read
- * barriers here to gurantee the writes in grow_ary() are seen in order
- * here (for Alpha).
- *
- * However ipc_get() itself does not necessary require ipc_ids.mutex down. So
- * if in the future ipc_get() is used by other places without ipc_ids.mutex
- * down, then ipc_get() needs read memery barriers as ipc_lock() does.
- */
-struct kern_ipc_perm *ipc_get(struct ipc_ids *ids, int id)
-{
- struct kern_ipc_perm *out;
- int lid = id % SEQ_MULTIPLIER;
- out = idr_find(&ids->ipcs_idr, lid);
- return out;
-}
-
struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id)
{
struct kern_ipc_perm *out;
Index: linux-2.6.23-rc2/ipc/shm.c
===================================================================
--- linux-2.6.23-rc2.orig/ipc/shm.c 2007-08-31 11:45:57.000000000 +0200
+++ linux-2.6.23-rc2/ipc/shm.c 2007-08-31 12:13:27.000000000 +0200
@@ -63,8 +63,6 @@ static struct ipc_ids init_shm_ids;
((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id))
#define shm_unlock(shp) \
ipc_unlock(&(shp)->shm_perm)
-#define shm_get(ns, id) \
- ((struct shmid_kernel*)ipc_get(&shm_ids(ns),id))
#define shm_buildid(ns, id, seq) \
ipc_buildid(&shm_ids(ns), id, seq)

@@ -562,7 +560,19 @@ static void shm_get_stat(struct ipc_name
struct shmid_kernel *shp;
struct inode *inode;

- shp = shm_get(ns, next_id);
+ /*
+ * idr_find() is called via shm_get(), so with shm_ids.mutex
+ * locked. Since ipc_addid() is also called with
+ * shm_ids.mutex down, there is no need to add read barriers
+ * here to gurantee the writes in ipc_addid() are seen in
+ * order here (for Alpha).
+ * However idr_find() itself does not necessary require
+ * ipc_ids.mutex down. So if idr_find() is used by other
+ * places without ipc_ids.mutex down, then it needs read
+ * read memory barriers as ipc_lock() does.
+ */
+
+ shp = idr_find(&shm_ids(ns).ipcs_idr, next_id);
if (shp == NULL)
continue;

--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-08-31 13:27    [from the cache]
©2003-2011 Jasper Spaans