rcu: Don't use NMIs to dump other CPUs' stacks
Although NMI-based stack dumps are in principle more accurate, they are also more likely to trigger deadlocks. This commit therefore replaces all uses of trigger_all_cpu_backtrace() with rcu_dump_cpu_stacks(), so that the CPU detecting an RCU CPU stall does the stack dumping. Signed-off-by:Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by:
Lai Jiangshan <laijs@cn.fujitsu.com>
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