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rcu/hotplug: Make rcutree_dead_cpu() parallel
In order to support parallel, rcu_state.n_online_cpus should be atomic_dec() Signed-off-by: Pingfan Liu <kernelfans@gmail.com> Cc: "Paul E. McKenney" <paulmck@kernel.org> Cc: Frederic Weisbecker <frederic@kernel.org> Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Price <steven.price@arm.com> Cc: "Peter Zijlstra Cc: Mark Rutland <mark.rutland@arm.com> Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> To: linux-kernel@vger.kernel.org To: rcu@vger.kernel.org
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