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UPSTREAM: 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>
Change-Id: I2fef472a0ce04d6bb32213500f57c72045b13633
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sorayukii <sorayukii69@gmail.com>
This commit is contained in:
Tejun Heo 2019-06-27 13:39:48 -07:00 • committed by Sorayukii
commit 7c73e874db
3 changed files with 4 additions and 0 deletions
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1
block/blk-cgroup.c
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@ -44,6 +44,7 @@ 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];

2
fs/fs-writeback.c
View file

@ -598,6 +598,7 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
if (unlikely(wb_dying(wbc->wb) && !css_is_dying(wbc->wb->memcg_css)))
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
@ -717,6 +718,7 @@ 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

1
include/linux/cgroup.h
View file

@ -704,6 +704,7 @@ void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen);
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; }