doc: Remove rcu_preempt_state reference in stallwarn

Consolidation of RCU-bh, RCU-preempt, and RCU-sched into one RCU flavor
to rule them all resulted in the removal of rcu_preempt_state.  However,
stallwarn.txt still mentions rcu_preempt_state.  This commit therefore
Updates stallwarn documentation accordingly.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: <kernel-team@android.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Joel Fernandes (Google) 2018-09-22 19:41:27 -04:00 • committed by Paul E. McKenney
commit dd944caa81