| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 041/267] cgroup, blkcg: Prepare some symbols for module and !CONFIG_CGROUP usages | Date | Fri, 19 Jun 2020 16:30:26 +0200 |
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From: Tejun Heo <tj@kernel.org>
commit 9b0eb69b75bccada2d341d7e7ca342f0cb1c9a6a upstream.
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.
[only backport the export of __inode_attach_wb for stable kernels - gregkh]
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/fs-writeback.c | 1 + 1 file changed, 1 insertion(+)
--- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -269,6 +269,7 @@ void __inode_attach_wb(struct inode *ino 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
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