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| author | Li Zefan <lizefan@huawei.com> | 2014-02-14 16:56:04 +0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-02-14 10:52:40 -0500 |
| commit | cc045e3952175e84c38dad22dea14465b9fc8fb5 (patch) | |
| tree | d331bc8403047232ea13fd6c3951c9ef347b1bac | |
| parent | 6534fd6c15858fe4ce4ae568106225e68d5afa81 (diff) | |
| download | blackbird-op-linux-cc045e3952175e84c38dad22dea14465b9fc8fb5.tar.gz blackbird-op-linux-cc045e3952175e84c38dad22dea14465b9fc8fb5.zip | |
cgroup: deal with dummp_top in cgroup_name() and cgroup_path()
My kernel fails to boot, because blkcg calls cgroup_path() while
cgroupfs is not mounted.
Fix both cgroup_name() and cgroup_path().
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
| -rw-r--r-- | include/linux/cgroup.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index ef0b3af0e61c..8c283a910b91 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -487,13 +487,21 @@ struct cgroup_subsys_state *seq_css(struct seq_file *seq); static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen) { - return kernfs_name(cgrp->kn, buf, buflen); + /* dummy_top doesn't have a kn associated */ + if (cgrp->kn) + return kernfs_name(cgrp->kn, buf, buflen); + else + return strlcpy(buf, "/", buflen); } static inline char * __must_check cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen) { - return kernfs_path(cgrp->kn, buf, buflen); + /* dummy_top doesn't have a kn associated */ + if (cgrp->kn) + return kernfs_path(cgrp->kn, buf, buflen); + strlcpy(buf, "/", buflen); + return (buflen <= 2) ? NULL : buf; } static inline void pr_cont_cgroup_name(struct cgroup *cgrp) |
