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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
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@@ -1918,6 +1918,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
the specified list of CPUs whose tick will be stopped
whenever possible. The boot CPU will be forced outside
the range to maintain the timekeeping.
+ The CPUs in this range must also be included in the
+ rcu_nocbs= set.
noiotrap [SH] Disables trapped I/O port accesses.
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