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| author | Nadia Derbey <Nadia.Derbey@bull.net> | 2008-07-25 01:48:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-25 10:53:42 -0700 |
| commit | 00c2bf85d8febfcfddde63822043462b026134ff (patch) | |
| tree | 25dbdf6d713408da992eace1168c45244d13c2a7 /ipc/shm.c | |
| parent | 983bfb7db303cfde56ae5bbf4e0f2f46e38c9576 (diff) | |
| download | lwn-00c2bf85d8febfcfddde63822043462b026134ff.tar.gz lwn-00c2bf85d8febfcfddde63822043462b026134ff.zip | |
ipc: get rid of ipc_lock_down()
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 <Nadia.Derbey@bull.net>
Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Jim Houston <jim.houston@comcast.net>
Cc: Pierre Peiffer <peifferp@gmail.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 21 |
1 files changed, 3 insertions, 18 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index a726aebce7d7..e77ec698cf40 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -112,23 +112,8 @@ void __init shm_init (void) } /* - * 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 && |