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* [RFC v1 0/2] RCU dyntick nesting counter cleanups
@ 2019-08-27  1:33 Joel Fernandes (Google)
  2019-08-28  0:11 ` Paul E. McKenney
  0 siblings, 1 reply; 4+ messages in thread
From: Joel Fernandes (Google) @ 2019-08-27  1:33 UTC (permalink / raw)
  To: linux-kernel
  Cc: Joel Fernandes (Google),
	Frederic Weisbecker, Jonathan Corbet, Josh Triplett, kernel-team,
	Lai Jiangshan, linux-doc, Mathieu Desnoyers,
	Mauro Carvalho Chehab, Paul E. McKenney, rcu, Steven Rostedt

These patches clean up the usage of dynticks nesting counters simplifying the
code, while preserving the usecases.

It is a much needed simplification, makes the code less confusing, and prevents
future bugs such as those that arise from forgetting that the
dynticks_nmi_nesting counter is not a simple counter and can be "crowbarred" in
common situations.

Several nights of rcutorture testing with CONFIG_RCU_EQS_DEBUG on all RCU
kernel configurations have survived without any splats.

Further testing is in progress, hence marked as RFC!


 - Joel

Joel Fernandes (Google) (2):
rcu/tree: Clean up dynticks counter usage
rcu/tree: Remove dynticks_nmi_nesting counter

.../Data-Structures/Data-Structures.rst       | 31 ++----
Documentation/RCU/stallwarn.txt               |  6 +-
kernel/rcu/rcu.h                              |  4 -
kernel/rcu/tree.c                             | 98 +++++++++----------
kernel/rcu/tree.h                             |  4 +-
kernel/rcu/tree_stall.h                       |  4 +-
6 files changed, 64 insertions(+), 83 deletions(-)


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-- links below jump to the message on this page --
2019-08-27  1:33 [RFC v1 0/2] RCU dyntick nesting counter cleanups Joel Fernandes (Google)
2019-08-28  0:11 ` Paul E. McKenney
2019-08-28 18:26   ` [PATCH] rcu/dyntick-idle: Add better tracing Joel Fernandes (Google)
2019-08-28 23:05     ` Paul E. McKenney

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