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

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Date:	Wed, 22 Aug 2012 18:23:38 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Chris Zankel <chris@...kel.net>, "3.2.x.." <stable@...nel.org>,
	Chen Liqin <liqin.chen@...plusct.com>,
	Lennox Wu <lennox.wu@...il.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Parisc <linux-parisc@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Koichi Yasutake <yasutake.koichi@...panasonic.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	m68k <linux-m68k@...ts.linux-m68k.org>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Cris <linux-cris-kernel@...s.com>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	alpha <linux-alpha@...r.kernel.org>
Subject: [PATCH 00/10] rcu: Add missing RCU idle APIs on idle loop

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

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