linux-kernel - Re: [PATCH tip/core/rcu 16/23] rcu: Prevent initialization-time quiescent-state race

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Date:	Thu, 06 Sep 2012 18:22:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Josh Triplett <josh@...htriplett.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 16/23] rcu: Prevent initialization-time
 quiescent-state race

On Thu, 2012-09-06 at 09:18 -0700, Paul E. McKenney wrote:
> On Thu, Sep 06, 2012 at 04:21:30PM +0200, Peter Zijlstra wrote:
> > On Wed, 2012-09-05 at 11:19 -0700, Paul E. McKenney wrote:
> > > I tried that, and got a surprisingly large set of conflicts.  Ah, OK,
> > > the problem is that breaking up rcu_gp_kthread() into subfunctions
> > > did enough code motion to defeat straightforward rebasing.  Is there
> > > some way to tell "git rebase" about such code motion, or would this
> > > need to be carried out carefully by hand? 
> > 
> > The alternative is doing that rebase by hand and in the process make
> > that code movement patch (6) obsolete by making patches (1) and (3)
> > introduce the code in the final form :-)
> > 
> > Yay for less patches :-)
> 
> Actually, my original intent was that patches 1-6 be one patch.
> The need to locate a nasty bug caused me to split it up.  So the best
> approach is to squash patches 1-6 together with the related patches.

I didn't mind the smaller steps, but patches like 6 which move newly
introduced code around are weird. As are patches fixing bugs introduced
in previous patches (of the same series).
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