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.
Signed-off-by: Tejun Heo <[email protected]> Reported-by: kbuild test robot <[email protected]> --- block/blk-cgroup.c | 1 + fs/fs-writeback.c | 3 +++ include/linux/cgroup.h | 1 + 3 files changed, 5 insertions(+) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 617a2b3f7582..07600d3c9520 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -46,6 +46,7 @@ struct blkcg blkcg_root; EXPORT_SYMBOL_GPL(blkcg_root); struct cgroup_subsys_state * const blkcg_root_css = &blkcg_root.css; +EXPORT_SYMBOL_GPL(blkcg_root_css); static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS]; diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 36855c1f8daf..c29cff345b1f 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -269,6 +269,7 @@ void __inode_attach_wb(struct inode *inode, struct page *page) if (unlikely(cmpxchg(&inode->i_wb, NULL, wb))) wb_put(wb); } +EXPORT_SYMBOL_GPL(__inode_attach_wb); /** * locked_inode_to_wb_and_lock_list - determine a locked inode's wb and lock it @@ -580,6 +581,7 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc, if (unlikely(wb_dying(wbc->wb))) inode_switch_wbs(inode, wbc->wb_id); } +EXPORT_SYMBOL_GPL(wbc_attach_and_unlock_inode); /** * wbc_detach_inode - disassociate wbc from inode and perform foreign detection @@ -699,6 +701,7 @@ void wbc_detach_inode(struct writeback_control *wbc) wb_put(wbc->wb); wbc->wb = NULL; } +EXPORT_SYMBOL_GPL(wbc_detach_inode); /** * wbc_account_io - account IO issued during writeback diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 81f58b4a5418..4cb5d5646986 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -687,6 +687,7 @@ 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; } -- 2.17.1
