From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org
Cc: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH 71/77] cgroup: convert to idr_alloc()
Date: Wed, 6 Feb 2013 11:40:43 -0800 [thread overview]
Message-ID: <1360179649-22465-72-git-send-email-tj@kernel.org> (raw)
In-Reply-To: <1360179649-22465-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Convert to the much saner new idr interface.
Only compile tested.
Signed-off-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Acked-by: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
kernel/cgroup.c | 27 ++++++++-------------------
1 file changed, 8 insertions(+), 19 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 525c508..29f9e11 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5284,7 +5284,7 @@ EXPORT_SYMBOL_GPL(free_css_id);
static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
{
struct css_id *newid;
- int myid, error, size;
+ int ret, size;
BUG_ON(!ss->use_id);
@@ -5292,35 +5292,24 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
newid = kzalloc(size, GFP_KERNEL);
if (!newid)
return ERR_PTR(-ENOMEM);
- /* get id */
- if (unlikely(!idr_pre_get(&ss->idr, GFP_KERNEL))) {
- error = -ENOMEM;
- goto err_out;
- }
+
+ idr_preload(GFP_KERNEL);
spin_lock(&ss->id_lock);
/* Don't use 0. allocates an ID of 1-65535 */
- error = idr_get_new_above(&ss->idr, newid, 1, &myid);
+ ret = idr_alloc(&ss->idr, newid, 1, CSS_ID_MAX + 1, GFP_NOWAIT);
spin_unlock(&ss->id_lock);
+ idr_preload_end();
/* Returns error when there are no free spaces for new ID.*/
- if (error) {
- error = -ENOSPC;
+ if (ret < 0)
goto err_out;
- }
- if (myid > CSS_ID_MAX)
- goto remove_idr;
- newid->id = myid;
+ newid->id = ret;
newid->depth = depth;
return newid;
-remove_idr:
- error = -ENOSPC;
- spin_lock(&ss->id_lock);
- idr_remove(&ss->idr, myid);
- spin_unlock(&ss->id_lock);
err_out:
kfree(newid);
- return ERR_PTR(error);
+ return ERR_PTR(ret);
}
--
1.8.1
prev parent reply other threads:[~2013-02-06 19:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1360179649-22465-1-git-send-email-tj@kernel.org>
[not found] ` <1360179649-22465-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2013-02-06 19:39 ` [PATCH 14/77] cgroup: don't use idr_remove_all() Tejun Heo
[not found] ` <1360179649-22465-15-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2013-02-07 1:29 ` Li Zefan
2013-02-06 19:40 ` Tejun Heo [this message]
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