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wbt_disable_default() calls del_timer_sync() to wait for the wbt
timer to finish before disabling throttling. We can't do this with
IRQs disable. This fixes a lockdep splat on boot, if non-root
cgroups are used.
Reported-by: Gabriel C <nix.or.die@gmail.com>
Fixes: 87760e5eef ("block: hook up writeback throttling")
Signed-off-by: Jens Axboe <axboe@fb.com>