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| author | Tejun Heo <tj@kernel.org> | 2013-04-07 09:29:51 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-04-07 09:29:51 -0700 |
| commit | b9777cf8d7c7854c3c38bd6621d993b85c2afcdf (patch) | |
| tree | d3f0275df187bb01a4262971f8fea6f4dbf7f26d | |
| parent | 7ae1bad99e27b8838d480a24edf4646a2fc547df (diff) | |
| download | linux-b9777cf8d7c7854c3c38bd6621d993b85c2afcdf.tar.gz linux-b9777cf8d7c7854c3c38bd6621d993b85c2afcdf.tar.bz2 linux-b9777cf8d7c7854c3c38bd6621d993b85c2afcdf.zip | |
cgroup: unexport locking interface and cgroup_attach_task()
Now that all external cgroup_lock() users are gone, we can finally
unexport the locking interface and prevent future abuse of
cgroup_mutex.
Make cgroup_[un]lock() and cgroup_lock_live_group() static. Also,
cgroup_attach_task() doesn't have any user left and can't be used
without locking interface anyway. Make it static too.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
| -rw-r--r-- | include/linux/cgroup.h | 5 | ||||
| -rw-r--r-- | kernel/cgroup.c | 9 |
2 files changed, 3 insertions, 11 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index f8eb01d75ddc..63deb70f3149 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -30,10 +30,7 @@ struct css_id; extern int cgroup_init_early(void); extern int cgroup_init(void); -extern void cgroup_lock(void); extern int cgroup_lock_is_held(void); -extern bool cgroup_lock_live_group(struct cgroup *cgrp); -extern void cgroup_unlock(void); extern void cgroup_fork(struct task_struct *p); extern void cgroup_post_fork(struct task_struct *p); extern void cgroup_exit(struct task_struct *p, int run_callbacks); @@ -693,8 +690,6 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp, struct cgroup_iter *it); void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it); int cgroup_scan_tasks(struct cgroup_scanner *scan); -int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk, - bool threadgroup); int cgroup_attach_task_all(struct task_struct *from, struct task_struct *); int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from); diff --git a/kernel/cgroup.c b/kernel/cgroup.c index ae7617095dec..32ca0304452f 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -336,7 +336,7 @@ static inline struct cftype *__d_cft(struct dentry *dentry) * On success, returns true; the lock should be later released with * cgroup_unlock(). On failure returns false with no lock held. */ -bool cgroup_lock_live_group(struct cgroup *cgrp) +static bool cgroup_lock_live_group(struct cgroup *cgrp) { mutex_lock(&cgroup_mutex); if (cgroup_is_removed(cgrp)) { @@ -345,7 +345,6 @@ bool cgroup_lock_live_group(struct cgroup *cgrp) } return true; } -EXPORT_SYMBOL_GPL(cgroup_lock_live_group); /* the list of cgroups eligible for automatic release. Protected by * release_list_lock */ @@ -824,22 +823,20 @@ static struct cgroup *task_cgroup_from_root(struct task_struct *task, * cgroup_lock - lock out any changes to cgroup structures * */ -void cgroup_lock(void) +static void cgroup_lock(void) { mutex_lock(&cgroup_mutex); } -EXPORT_SYMBOL_GPL(cgroup_lock); /** * cgroup_unlock - release lock on cgroup changes * * Undo the lock taken in a previous cgroup_lock() call. */ -void cgroup_unlock(void) +static void cgroup_unlock(void) { mutex_unlock(&cgroup_mutex); } -EXPORT_SYMBOL_GPL(cgroup_unlock); /* * A couple of forward declarations required, due to cyclic reference loop: |