From 647dd4cd7c2137194811d8585a7500dab3d328c0 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 4 Nov 2022 14:16:48 -0700 Subject: [PATCH] doc: Update rcu.rst This commit provides a couple of updates based on the inexorable passage of time. Signed-off-by: Paul E. McKenney --- Documentation/RCU/rcu.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/RCU/rcu.rst b/Documentation/RCU/rcu.rst index 3cfe01ba9a494..381cb86f657d8 100644 --- a/Documentation/RCU/rcu.rst +++ b/Documentation/RCU/rcu.rst @@ -77,12 +77,13 @@ Frequently Asked Questions search for the string "Patent" in Documentation/RCU/RTFP.txt to find them. Of these, one was allowed to lapse by the assignee, and the others have been contributed to the Linux kernel under GPL. + Many (but not all) have long since expired. There are now also LGPL implementations of user-level RCU available (https://liburcu.org/). - I hear that RCU needs work in order to support realtime kernels? - Realtime-friendly RCU can be enabled via the CONFIG_PREEMPT_RCU + Realtime-friendly RCU are enabled via the CONFIG_PREEMPTION kernel configuration parameter. - Where can I find more information on RCU? -- 2.30.2