tracing: Make sure RCU is watching before calling a stack trace
As stack tracing now requires "rcu watching", force RCU to be watching when recording a stack trace. Link: http://lkml.kernel.org/r/20170512172449.879684501@goodmis.orgAcked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: NSteven Rostedt (VMware) <rostedt@goodmis.org>
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