rcu: Simplify rcu_eqs_{enter,exit}() non-idle task debug code
The code that checks for non-idle non-nohz_idle-usermode tasks invoking
rcu_eqs_enter() and rcu_eqs_exit() prints a considerable quantity of
helpful information. However, these checks fire rarely, so the extra
complexity is no longer worth it. This commit therefore replaces this
debug code with simple WARN_ON_ONCE() statements.
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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