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authorTejun Heo <tj@kernel.org>2014-05-13 12:11:01 -0400
committerTejun Heo <tj@kernel.org>2014-05-13 12:11:01 -0400
commitec903c0c858e4963a9e0724bdcadfa837253341c (patch)
treeb52cd0d5bcac48d2d9c21e6186397c29ef89c33b /kernel/cgroup_freezer.c
parent46cfeb043b04f5878154bea36714709d46028495 (diff)
cgroup: rename css_tryget*() to css_tryget_online*()
Unlike the more usual refcnting, what css_tryget() provides is the distinction between online and offline csses instead of protection against upping a refcnt which already reached zero. cgroup is planning to provide actual tryget which fails if the refcnt already reached zero. Let's rename the existing trygets so that they clearly indicate that they're onliness. I thought about keeping the existing names as-are and introducing new names for the planned actual tryget; however, given that each controller participates in the synchronization of the online state, it seems worthwhile to make it explicit that these functions are about on/offline state. Rename css_tryget() to css_tryget_online() and css_tryget_from_dir() to css_tryget_online_from_dir(). This is pure rename. v2: cgroup_freezer grew new usages of css_tryget(). Update accordingly. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Diffstat (limited to 'kernel/cgroup_freezer.c')
-rw-r--r--kernel/cgroup_freezer.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 345628c78b5b..0398f7e9ac81 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -304,7 +304,7 @@ static int freezer_read(struct seq_file *m, void *v)
/* update states bottom-up */
css_for_each_descendant_post(pos, css) {
- if (!css_tryget(pos))
+ if (!css_tryget_online(pos))
continue;
rcu_read_unlock();
@@ -404,7 +404,7 @@ static void freezer_change_state(struct freezer *freezer, bool freeze)
struct freezer *pos_f = css_freezer(pos);
struct freezer *parent = parent_freezer(pos_f);
- if (!css_tryget(pos))
+ if (!css_tryget_online(pos))
continue;
rcu_read_unlock();