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Documentation/sysctl: document max_rcu_stall_to_panic

commit dfe564045c65 ("rcu: Panic after fixed number of stalls")
introduced a new systctl but no accompanying documentation.

Add a simple entry to the documentation.

Signed-off-by: Joel Savitz <jsavitz@redhat.com>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

authored by

Joel Savitz and committed by
Jonathan Corbet
81c65365 a477b94d

+7
+7
Documentation/admin-guide/sysctl/kernel.rst
··· 783 783 1 panic() after printing RCU stall messages. 784 784 = ============================================================ 785 785 786 + max_rcu_stall_to_panic 787 + ====================== 788 + 789 + When ``panic_on_rcu_stall`` is set to 1, this value determines the 790 + number of times that RCU can stall before panic() is called. 791 + 792 + When ``panic_on_rcu_stall`` is set to 0, this value is has no effect. 786 793 787 794 perf_cpu_time_max_percent 788 795 =========================