linux-kernel - [PATCH RFC idle] Make arm, sh, and x86 stop using RCU when idle

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Date:	Wed, 1 Feb 2012 16:42:53 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org
Subject: [PATCH RFC idle] Make arm, sh, and x86 stop using RCU when idle

Hello!

RCU's shiny new diagnostics (thank you, Frederic!) for using RCU when idle
located a few problems in arm, sh, and x86.  This patch series contains
alleged fixes for these problems.  And they are real problems -- if RCU
believes that the CPU is idle, it is ignoring it.  Which means that the
idle CPU can say "rcu_read_lock()" all it like, but there will be no
useful effect.

I was tempted to break these up, but doing so is bad for bisectability.

							Thanx, Paul

------------------------------------------------------------------------

 arch/arm/kernel/process.c          |    2 --
 arch/arm/mach-at91/cpuidle.c       |    3 +++
 arch/arm/mach-davinci/cpuidle.c    |    3 +++
 arch/arm/mach-exynos/common.c      |    2 ++
 arch/arm/mach-highbank/pm.c        |   12 ++++++++++++
 arch/arm/mach-imx/mm-imx3.c        |    3 +++
 arch/arm/mach-imx/pm-imx27.c       |    4 ++++
 arch/arm/mach-imx/pm-imx6q.c       |    4 ++++
 arch/arm/mach-kirkwood/cpuidle.c   |    3 +++
 arch/arm/mach-mx5/mm.c             |    3 +++
 arch/arm/mach-mx5/pm-imx5.c        |    3 +++
 arch/arm/mach-mxs/pm.c             |    4 ++++
 arch/arm/mach-omap1/pm.c           |    4 ++++
 arch/arm/mach-omap2/pm24xx.c       |    2 ++
 arch/arm/mach-omap2/pm34xx.c       |    2 ++
 arch/arm/mach-omap2/pm44xx.c       |    3 +++
 arch/arm/mach-pnx4008/pm.c         |    2 ++
 arch/arm/mach-prima2/pm.c          |    4 ++++
 arch/arm/mach-s5p64x0/common.c     |    2 ++
 arch/arm/mach-s5pc100/common.c     |    2 ++
 arch/arm/mach-s5pv210/common.c     |    2 ++
 arch/arm/mach-shmobile/cpuidle.c   |    3 +++
 arch/arm/mach-shmobile/pm-sh7372.c |    8 ++++++++
 arch/sh/kernel/idle.c              |   11 ++++++++---
 arch/x86/kernel/process.c          |   13 ++++++++++++-
 arch/x86/kernel/process_32.c       |    2 --
 arch/x86/kernel/process_64.c       |    4 ----
 drivers/idle/intel_idle.c          |    2 ++
 28 files changed, 100 insertions(+), 12 deletions(-)

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