locking/percpu-rwsem: Clean up the lockdep annotations in percpu_down_read()
Based on Peter Zijlstra's earlier patch. Change percpu_down_read() to use __down_read(), this way we can do rwsem_acquire_read() unconditionally at the start to make this code more symmetric and clean. Originally-From: Peter Zijlstra <peterz@infradead.org> Signed-off-by:Oleg Nesterov <oleg@redhat.com> Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by:
Josh Triplett <josh@joshtriplett.org>
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