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    SubjectRe: [PATCH] blk-cgroup: Call cgroup_path only under cgroup lock
    On Mon, Mar 12, 2012 at 8:04 PM, Tejun Heo <tj@kernel.org> wrote:
    > Hello, Sasha.
    >
    > On Mon, Mar 12, 2012 at 04:01:18PM -0400, Sasha Levin wrote:
    >> Since we can't keep rcu read lock during blkg_alloc(), we currently
    >> call cgroup_path() without any locks at all.
    >>
    >> This patch adds cgroup locking before calling cgroup_path.
    >>
    >> This also fixes a lockdep warning on boot.
    >>
    >> Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
    >
    > Which branch is this against?  There's already pending stat update
    > patch from Vivek which fix this problem along with the percpu
    > allocation problem.
    >
    > Thanks.

    I've fixed it for linux-next.
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