linux-kernel - Re: [PATCH 00/11] rcu: Detect illegal uses of RCU in idle and fix some v5

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Message-ID: <20111007233235.GJ2696@linux.vnet.ibm.com>
Date:	Fri, 7 Oct 2011 16:32:35 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Henroid <andrew.d.henroid@...el.com>,
	Mike Frysinger <vapier@...too.org>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	David Miller <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Russell King <linux@....linux.org.uk>,
	Paul Mackerras <paulus@...ba.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: Re: [PATCH 00/11] rcu: Detect illegal uses of RCU in idle and fix
 some v5

On Fri, Oct 07, 2011 at 06:21:59PM +0200, Frederic Weisbecker wrote:
> Hi Paul,
> 
> Here is the rebase. And it's more than just a rebase given the
> semantical changes after your patch that tracks idleness. And also
> because of the new API naming (with a new pair of tick_nohz_idle_enter()
> tick_nohz_idle_exit() with *_norcu suffixes).
> 
> I have reused and updated some comments (that you made on earlier
> versions of my patchset) that assumed that extended qs = dynticks
> idle, as it's not always true anymore. I've tried to bring a new
> wording to express what we are dealing with: "RCU-free window in idle"
> or "RCU-idle window". I let you update the comments if you think
> that's confusing or too scarce.
> 
> It has passed several hours of rcutorture with NO_HZ && SMP, and at least
> booted fine with all your configs.

Thank you, Frederic!  I have queued these locally and will start
testing them.

						Thanx, Paul

> Frederic Weisbecker (9):
>   rcu: Detect illegal rcu dereference in extended quiescent state
>   rcu: Inform the user about extended quiescent state on PROVE_RCU warning
>   rcu: Warn when rcu_read_lock() is used in extended quiescent state
>   rcu: Make srcu_read_lock_held() call common lockdep-enabled function
>   nohz: Separate out irq exit and idle loop dyntick logic
>   nohz: Allow rcu extended quiescent state handling seperately from tick stop
>   x86: Enter rcu extended qs after idle notifier call
>   x86: Call idle notifier after irq_enter()
>   rcu: Fix early call to rcu_idle_enter()
> 
> Paul E. McKenney (2):
>   rcu: Remove one layer of abstraction from PROVE_RCU checking
>   rcu: Warn when srcu_read_lock() is used in an extended quiescent state
> 
>  arch/arm/kernel/process.c                |    4 +-
>  arch/avr32/kernel/process.c              |    4 +-
>  arch/blackfin/kernel/process.c           |    4 +-
>  arch/microblaze/kernel/process.c         |    4 +-
>  arch/mips/kernel/process.c               |    4 +-
>  arch/openrisc/kernel/idle.c              |    4 +-
>  arch/powerpc/kernel/idle.c               |    4 +-
>  arch/powerpc/platforms/iseries/setup.c   |    8 +-
>  arch/s390/kernel/process.c               |    4 +-
>  arch/sh/kernel/idle.c                    |    4 +-
>  arch/sparc/kernel/process_64.c           |    4 +-
>  arch/tile/kernel/process.c               |    4 +-
>  arch/um/kernel/process.c                 |    4 +-
>  arch/unicore32/kernel/process.c          |    4 +-
>  arch/x86/kernel/apic/apic.c              |    6 +-
>  arch/x86/kernel/apic/io_apic.c           |    2 +-
>  arch/x86/kernel/cpu/mcheck/therm_throt.c |    2 +-
>  arch/x86/kernel/cpu/mcheck/threshold.c   |    2 +-
>  arch/x86/kernel/irq.c                    |    6 +-
>  arch/x86/kernel/process_32.c             |    4 +-
>  arch/x86/kernel/process_64.c             |   10 +++-
>  include/linux/rcupdate.h                 |   74 +++++++++++++++--------
>  include/linux/srcu.h                     |   38 ++++++++----
>  include/linux/tick.h                     |   52 ++++++++++++++--
>  kernel/lockdep.c                         |   22 +++++++
>  kernel/rcupdate.c                        |    4 +
>  kernel/rcutiny.c                         |    1 +
>  kernel/rcutree.c                         |   19 +++++-
>  kernel/softirq.c                         |    4 +-
>  kernel/time/tick-sched.c                 |   96 ++++++++++++++++++-----------
>  30 files changed, 273 insertions(+), 129 deletions(-)
> 
> -- 
> 1.7.5.4
> 
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