add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/kernel/rcu/tree.h
..
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@@ -56,6 +56,7 @@
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 				/*  Initialized from ->qsmaskinitnext at the */
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 				/*  beginning of each grace period. */
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 	unsigned long qsmaskinitnext;
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+	unsigned long ofl_seq;	/* CPU-hotplug operation sequence count. */
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 				/* Online CPUs for next grace period. */
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 	unsigned long expmask;	/* CPUs or groups that need to check in */
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 				/*  to allow the current expedited GP */