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blk-cgroup: Remove unnecessary rcu_read_lock/unlock()
spin_lock_irq/spin_unlock_irq contains preempt_disable/enable(). Which can serve as RCU read-side critical region, so remove rcu_read_lock/unlock(). Signed-off-by: Fanjun Kong <[email protected]> Reviewed-by: Muchun Song <[email protected]> Acked-by: Tejun Heo <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
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