linux-kernel - [RFC GIT PULL] nohz: Kconfig layout improvements

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Date:	Wed,  3 Apr 2013 14:46:26 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Marek <mmarek@...e.cz>
Subject: [RFC GIT PULL] nohz: Kconfig layout improvements

Ingo,

This set addresses your review concerning the Kconfig layout.
Please note two things here that derive from what we agreed
on due to technical limitations:

* Now the full dynticks Kconfig is not hidden anymore behind its
high level dependencies. (ie: passive dependencies are now active).
There is an exception though with CONFIG_VIRT_CPU_ACCOUNTING_GEN
(Full dynticks cputime accounting) that is part of a choice menu
like PREEMPT_*. It seems such kconfig layout prevent from doing a remote
select on its choices. So it stays a passive dependency for now, until
Kconfig/Kbuild supports that (Cc'ing Michel Marek) or somebody shows
me what I did wrong ;)

* Ideally we want to reuse CONFIG_NO_HZ as a Kconfig that consolidate
the common code between CONFIG_NO_HZ_IDLE and CONFIG_NO_HZ_EXTENDED.
But we also want CONFIG_NO_HZ from old config files to map to CONFIG_NO_HZ_IDLE.
Both at the same time is not possible or we have a Kconfig circular
dependency. So I introduced a new CONFIG_NO_HZ_COMMON for common nohz code
and CONFIG_NO_HZ stays for backward compatibility by enabling CONFIG_NO_HZ_IDLE
by default.

If you're ok, please pull from:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/nohz-v2

Thanks.

---
Frederic Weisbecker (4):
  nohz: Unhide full dynticks feature from its dependencies
  nohz: Rename CONFIG_NO_HZ to CONFIG_NO_HZ_COMMON
  nohz: Pack nohz Kconfig option in a menu of choices
  nohz: Print final full dynticks CPUs range on boot

 Documentation/RCU/stallwarn.txt         |    2 +-
 Documentation/cpu-freq/governors.txt    |    4 +-
 arch/um/include/shared/common-offsets.h |    4 +-
 arch/um/os-Linux/time.c                 |    2 +-
 include/linux/sched.h                   |    8 ++--
 include/linux/tick.h                    |    8 ++--
 init/Kconfig                            |    2 +-
 kernel/hrtimer.c                        |    4 +-
 kernel/sched/core.c                     |   18 +++++-----
 kernel/sched/fair.c                     |   10 +++---
 kernel/sched/sched.h                    |    4 +-
 kernel/softirq.c                        |    2 +-
 kernel/time/Kconfig                     |   54 ++++++++++++++++++++++++------
 kernel/time/tick-sched.c                |   22 +++++++++---
 kernel/timer.c                          |    4 +-
 15 files changed, 95 insertions(+), 53 deletions(-)

-- 
1.7.5.4

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