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* [PATCH 00/10] rcu: Add missing RCU idle APIs on idle loop
@ 2012-08-22 16:23 Frederic Weisbecker
  2012-08-22 16:23 ` [PATCH 08/10] parisc: " Frederic Weisbecker
  2012-08-22 17:18 ` [PATCH 00/10] rcu: " Geert Uytterhoeven
  0 siblings, 2 replies; 9+ messages in thread
From: Frederic Weisbecker @ 2012-08-22 16:23 UTC (permalink / raw)
  To: LKML
  Cc: Frederic Weisbecker, Paul E. McKenney, Chris Zankel, 3.2.x..,
	Chen Liqin, Lennox Wu, James E.J. Bottomley, Helge Deller, Parisc,
	David Howells, Koichi Yasutake, Geert Uytterhoeven, m68k,
	Hirokazu Takata, Yoshinori Sato, Mikael Starvik, Jesper Nilsson,
	Cris, Richard Henderson, Ivan Kokshaysky, Matt Turner, alpha

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(-)

-- 
1.7.5.4


^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2012-09-17 20:55 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-08-22 16:23 [PATCH 00/10] rcu: Add missing RCU idle APIs on idle loop Frederic Weisbecker
2012-08-22 16:23 ` [PATCH 08/10] parisc: " Frederic Weisbecker
2012-08-24 13:26   ` John David Anglin
2012-08-22 17:18 ` [PATCH 00/10] rcu: " Geert Uytterhoeven
2012-08-23 11:02   ` Frederic Weisbecker
2012-08-23 20:23     ` Geert Uytterhoeven
2012-08-23 21:50       ` Frederic Weisbecker
2012-09-17 20:31         ` Geert Uytterhoeven
2012-09-17 20:55           ` Paul E. McKenney

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