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

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Message-ID: <CAMuHMdURT2vdF8uGZbMO09iGbLeSaVzwNthKEA1WwOtH6dQN_A@mail.gmail.com>
Date:	Mon, 17 Sep 2012 22:31:24 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	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>,
	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: Re: [PATCH 00/10] rcu: Add missing RCU idle APIs on idle loop

Hi Frederic, Paul,

On Thu, Aug 23, 2012 at 11:50 PM, Frederic Weisbecker
<fweisbec@...il.com> wrote:
> On Thu, Aug 23, 2012 at 10:23:22PM +0200, Geert Uytterhoeven wrote:
>> On Thu, Aug 23, 2012 at 1:02 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
>> > On Wed, Aug 22, 2012 at 07:18:04PM +0200, Geert Uytterhoeven wrote:
>> >> On Wed, Aug 22, 2012 at 6:23 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
>> >> > 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 can take the m68k version, but are you sure you want it this way?
>> >> Each of them must be in mainline before they can enter stable.
>> >
>> > Yeah, I was thinking the right route is for these patches to be
>> > carried by arch maintainer who then push to Linus and then this goes
>> > to stable.
>> >
>> > Is that ok for you?
>> >
>> > Otherwise I can carry the patches myself. In a tree of my own, or
>> > Paul's or mmotm. As long as I have your ack.
>>
>> I applied your patch to the m68k for-3.6/for-linus branch.
>> I'll ask Linus to pull later in the rc cycle (right now I don't have
>> anything else
>> queued for 3.6).
>> Still, I think it's better to just collect acks and send it to Linus
>> in one shot,
>> so it can go into stable in one shot too.
>
> Sure I can do that if you prefer.

What's the conclusion on this one? I saw it entered tip.

I still have it (as the only commit) on my for-3.6 branch, but I don't
think m68k
is important enough to be the only architecture to have this fix in 3.6 ;-)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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