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doc: Update rcu.rst

This commit provides a couple of updates based on the inexorable passage
of time.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

+2 -1
+2 -1
Documentation/RCU/rcu.rst
··· 77 77 search for the string "Patent" in Documentation/RCU/RTFP.txt to find them. 78 78 Of these, one was allowed to lapse by the assignee, and the 79 79 others have been contributed to the Linux kernel under GPL. 80 + Many (but not all) have long since expired. 80 81 There are now also LGPL implementations of user-level RCU 81 82 available (https://liburcu.org/). 82 83 83 84 - I hear that RCU needs work in order to support realtime kernels? 84 85 85 - Realtime-friendly RCU can be enabled via the CONFIG_PREEMPT_RCU 86 + Realtime-friendly RCU are enabled via the CONFIG_PREEMPTION 86 87 kernel configuration parameter. 87 88 88 89 - Where can I find more information on RCU?