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Subject[PATCH RFC 0/3] Fix cpuidle_idle_call() RCU usage

This patch series is a second attempt to fix the idle-loop uses of RCU,
see for v1. Where the first series
attempted to drive rcu_idle_enter() and rcu_idle_exit() further down
into the Linux kernels multitude of idle loops, this patch instead
marks specific idle-loop operations containing RCU read-side critical
sections, as suggested by Nicolas Pitre and Steven Rostedt. The possibility
of code shared between idle and non-idle also requires the ability to nest
rcu_idle_enter() calls. The individual patches are as follows:

1. Allow nesting of rcu_idle_enter() and rcu_idle_exit().
2. Add an RCU_NONIDLE() macro to enclose idle-loop code that
contains RCU read-side critical sections.
3. Use RCU_NONIDLE() to protect cpuidle_idle_call()'s tracepoints.

This patchset has the distinct advantage of avoiding touching any
architecture-specific code. ;-)

Thanx, Paul


b/drivers/cpuidle/cpuidle.c | 12 ++++++++----
b/include/linux/rcupdate.h | 27 +++++++++++++++++++++++++++
b/kernel/rcu.h | 18 +++++++++++++++++-
b/kernel/rcutiny.c | 16 ++++++++++++----
b/kernel/rcutree.c | 19 +++++++++++++------
kernel/rcutiny.c | 2 ++
kernel/rcutree.c | 2 ++
7 files changed, 81 insertions(+), 15 deletions(-)

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