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    Subject[PATCH 1/9] cgroup, blkcg: Prepare some symbols for module and !CONFIG_CGROUP usages
    Date
    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 <tj@kernel.org>
    Reported-by: kbuild test robot <lkp@intel.com>
    ---
    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
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