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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/events
parent46cfeb043b04f5878154bea36714709d46028495 (diff)
downloadlinux-ec903c0c858e4963a9e0724bdcadfa837253341c.tar.bz2
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/events')
-rw-r--r--kernel/events/core.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f83a71a3e46d..077968d19b8a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -607,7 +607,8 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
if (!f.file)
return -EBADF;
- css = css_tryget_from_dir(f.file->f_dentry, &perf_event_cgrp_subsys);
+ css = css_tryget_online_from_dir(f.file->f_dentry,
+ &perf_event_cgrp_subsys);
if (IS_ERR(css)) {
ret = PTR_ERR(css);
goto out;