LKMM updates for v5.1

Hello, Ingo,

This series contains updates for the Linux-kernel memory model, which are ready for inclusion into -tip:

1-5. Add support for SRCU, courtesy of Alan Stern.

6. Dynamically check SRCU lock-to-unlock matching, courtesy of
Luc Maranget.

7. Avoid duplicating herdtools versions in documentation, courtesy
of Andrea Parri.

Thanx, Paul

------------------------------------------------------------------------

 Documentation/explanation.txt |  289 ++++++++++++++++++++++--------------------
 README                        |   33 ++++
 linux-kernel.bell             |   37 ++++-
 linux-kernel.cat              |   57 +++++---
 linux-kernel.def              |    7 -
 lock.cat                      |    3 
 6 files changed, 254 insertions(+), 172 deletions(-)