cgroup: update cgroup name handling
Straightforward updates to cgroup name handling in preparation of kernfs conversion. * cgroup_alloc_name() is updated to take const char * isntead of dentry * for name source. * cgroup name formatting is separated out into cgroup_file_name(). While at it, buffer length protection is added. Signed-off-by: NTejun Heo <tj@kernel.org> Acked-by: NLi Zefan <lizefan@huawei.com>
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