[PATCH 00/10] rcu: Add missing RCU idle APIs on idle loop

[Frederic Weisbecker <fweisbec@gmail.com>]

So this fixes some potential RCU stalls in a bunch of architectures.
When rcu_idle_enter()/rcu_idle_exit() became a requirement, we forgot
to handle the architectures that don't support CONFIG_NO_HZ.

I guess the set should be dispatched into arch maintainer trees.

I'm sorry I haven't built tested everywhere. But the changes are
small and need to be at least boot tested anyway.

Also many of these archs use the same kind of idle loop:

void cpu_idle(void)
{
        while (1) {
                rcu_idle_enter();
                while (!need_resched())
                        //power saving function()
                rcu_idle_exit();
                schedule_preempt_disabled();
        }
}

So once the set is merged, I'll probably try to consolidate this with a generic
simple cpu_idle() that does the above and calls the arch power saving
function. This will be only for archs that use this simple idle loop
of course.

Thanks.

Frederic Weisbecker (10):
  alpha: Add missing RCU idle APIs on idle loop
  cris: Add missing RCU idle APIs on idle loop
  frv: Add missing RCU idle APIs on idle loop
  h8300: Add missing RCU idle APIs on idle loop
  m32r: Add missing RCU idle APIs on idle loop
  m68k: Add missing RCU idle APIs on idle loop
  mn10300: Add missing RCU idle APIs on idle loop
  parisc: Add missing RCU idle APIs on idle loop
  score: Add missing RCU idle APIs on idle loop
  xtensa: Add missing RCU idle APIs on idle loop

 arch/alpha/kernel/process.c   |    6 +++++-
 arch/cris/kernel/process.c    |    3 +++
 arch/frv/kernel/process.c     |    3 +++
 arch/h8300/kernel/process.c   |    3 +++
 arch/m32r/kernel/process.c    |    3 +++
 arch/m68k/kernel/process.c    |    3 +++
 arch/mn10300/kernel/process.c |    3 +++
 arch/parisc/kernel/process.c  |    3 +++
 arch/score/kernel/process.c   |    4 +++-
 arch/xtensa/kernel/process.c  |    3 +++
 10 files changed, 32 insertions(+), 2 deletions(-)

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1.7.5.4