[PATCH 0/5] xen/rcu: rework the RCU logic

[Roger Pau Monne <roger@xxxxxxxxxxxxxx>]

Hello,

Following series aims to solve two problems we have observed with the
RCU subsystem, complete details on patch 4.

The series is basically a re-write (and IMO simplification) of the RCU
logic, patch 4 containing most of the newly introduced logic.

It's been (slightly) tested locally and on the safety CI.  Maybe I'm
being naive, but this looks much easier to reason about and maintain
than the current logic.

This "simplification" is only possible after the introduction of
rcu_read_{lock,unlock}() helpers that identify RCU critical sections.

Thanks, Roger.

Roger Pau Monne (5):
  xen/rcu: fix types
  xen/rcu: sort includes
  xen/rcu: introduce the concept of RCU epoch
  xen/rcu: simplify RCU implementation
  xen/rcu: remove rcu_needs_cpu()

 xen/common/rcupdate.c      | 502 +++++++++----------------------------
 xen/include/xen/rcupdate.h |  45 ++--
 xen/include/xen/sched.h    |   2 +-
 3 files changed, 153 insertions(+), 396 deletions(-)

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2.53.0