linux-kernel - Re: [PATCH 0/7 v4] rcu: Fix some rcu uses in extended quiescent state

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Message-ID: <20110926182629.GI2399@linux.vnet.ibm.com>
Date:	Mon, 26 Sep 2011 11:26:29 -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 0/7 v4] rcu: Fix some rcu uses in extended quiescent
 state

On Mon, Sep 26, 2011 at 12:19:05PM +0200, Frederic Weisbecker wrote:
> Hi Paul,
> 
> Two fixes added in that set, the first two patches:
> 
> - The check on uses under extended quiescent states was buggy
> - One more illegal use of RCU fixed, from inside tick_nohz_stop_sched_tick()
> 
> It has survived one day and one night of rcutorture in x86-64
> with periodic cpu hotplug onlining/offlining...

Very good!  I have queued these and pushed them to -rcu on github
(https://github.com/paulmckrcu/linux) branch rcu/dynticks.

Some of the Power boxes are now back in the land of the living, and
will hopefully work their way through their testing backlogs some time
soon.  ;-)  At which point, I will restart PowerPC testing.

							Thanx, Paul

> No test in powerpc yet though... So I don't know yet why
> you got an rcutorture failure.
> 
> Frederic Weisbecker (7):
>   rcu: Fix preempt-unsafe debug check of rcu extended quiescent state
>   rcu: Fix early call to rcu_enter_nohz() on tick stopping
>   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_irq_exit()
> 
>  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/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/mce.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             |    9 ++-
>  include/linux/tick.h                     |   12 ++-
>  kernel/rcutree.c                         |   10 ++-
>  kernel/softirq.c                         |    4 +-
>  kernel/time/tick-sched.c                 |  120 +++++++++++++++++++++---------
>  25 files changed, 147 insertions(+), 88 deletions(-)
> 
> -- 
> 1.7.5.4
> 
> --
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