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cgroup, blkcg: Prepare some symbols for module and !CONFIG_CGROUP usages

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btrfs is going to use css_put() and wbc helpers to improve cgroup
writeback support.  Add dummy css_get() definition and export wbc
helpers to prepare for module and !CONFIG_CGROUP builds.

Reported-by: kbuild test robot <lkp@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2019-06-27 13:39:48 -07:00 • committed by Jens Axboe
parent fd112c7465
commit 9b0eb69b75
3 changed files with 5 additions and 0 deletions
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1
include/linux/cgroup.h
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@ -699,6 +699,7 @@ void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
struct cgroup_subsys_state;
struct cgroup;
static inline void css_get(struct cgroup_subsys_state *css) {}
static inline void css_put(struct cgroup_subsys_state *css) {}
static inline int cgroup_attach_task_all(struct task_struct *from,
struct task_struct *t) { return 0; }