From: Paul E. McKenney Date: Fri, 4 Nov 2022 21:16:48 +0000 (-0700) Subject: doc: Update rcu.rst X-Git-Tag: io_uring-6.3-2023-03-03~30^2~11 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=647dd4cd7c2137194811d8585a7500dab3d328c0;p=linux-2.6-block.git doc: Update rcu.rst This commit provides a couple of updates based on the inexorable passage of time. Signed-off-by: Paul E. McKenney --- diff --git a/Documentation/RCU/rcu.rst b/Documentation/RCU/rcu.rst index 3cfe01ba9a49..381cb86f657d 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?