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ipc: get rid of ipc_lock_down()

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Remove the ipc_lock_down() routines: they used to call idr_find() locklessly
(given that the ipc ids lock was already held), so they are not needed
anymore.

Signed-off-by: Nadia Derbey <[email protected]>
Acked-by: "Paul E. McKenney" <[email protected]>
Cc: Manfred Spraul <[email protected]>
Cc: Jim Houston <[email protected]>
Cc: Pierre Peiffer <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nadia Derbey 2008-07-25 01:48:03 -07:00 • committed by Linus Torvalds
commit 00c2bf85d8
3 changed files with 4 additions and 75 deletions
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21
ipc/shm.c
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@ -111,24 +111,9 @@ void __init shm_init (void)
IPC_SHM_IDS, sysvipc_shm_proc_show);
}
/*
* shm_lock_(check_)down routines are called in the paths where the rw_mutex
* is held to protect access to the idr tree.
*/
static inline struct shmid_kernel *shm_lock_down(struct ipc_namespace *ns,
int id)
{
struct kern_ipc_perm *ipcp = ipc_lock_down(&shm_ids(ns), id);
if (IS_ERR(ipcp))
return (struct shmid_kernel *)ipcp;
return container_of(ipcp, struct shmid_kernel, shm_perm);
}
/*
* shm_lock_(check_) routines are called in the paths where the rw_mutex
* is not held.
* is not necessarily held.
*/
static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
{
@ -211,7 +196,7 @@ static void shm_close(struct vm_area_struct *vma)
down_write(&shm_ids(ns).rw_mutex);
/* remove from the list of attaches of the shm segment */
shp = shm_lock_down(ns, sfd->id);
shp = shm_lock(ns, sfd->id);
BUG_ON(IS_ERR(shp));
shp->shm_lprid = task_tgid_vnr(current);
shp->shm_dtim = get_seconds();
@ -932,7 +917,7 @@ invalid:
out_nattch:
down_write(&shm_ids(ns).rw_mutex);
shp = shm_lock_down(ns, shmid);
shp = shm_lock(ns, shmid);
BUG_ON(IS_ERR(shp));
shp->shm_nattch--;
if(shp->shm_nattch == 0 &&