Date: Fri, 12 Jun 2009 15:49:40 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
       Linus <torvalds@linux-foundation.org>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-kernel@vger.kernel.org,
       linux-next@vger.kernel.org, paulus@samba.org,
       ppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: linux-next: origin tree build failure
Message-ID: <20090612134940.GD32105@elte.hu>
References: <20090612102427.32582baa.sfr@canb.auug.org.au> <1244768406.7172.1.camel@pasglop> <20090612092054.GB32052@elte.hu> <1244799197.7172.106.camel@pasglop> <20090612125335.GH31845@elte.hu> <1244812224.7172.146.camel@pasglop> <1244813397.7172.156.camel@pasglop>
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* Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> On Fri, 2009-06-12 at 23:10 +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2009-06-12 at 14:53 +0200, Ingo Molnar wrote:
> 
> > To some extent, here, the issue is on Linus side and it's up to him (Hey
> > Linus ! still listening ?) to maybe be more proactive at giving an ack
> > or nack so that we can get a chance to do that final pass of ironing out
> > the mechanical bugs before we hit the main tree.
> 
> Let me add a little bit more background to my reasoning here and why I
> think having this integration testing step is so valuable...
> 
> It all boils down to bisection and having a bisectable tree.

I think you are way too concentrated on this particular incident, 
and you are generalizing it into something that is not so in 
practice.

Even in this particular case, there's just 3 other commit points in 
the Git tree between commit 8a1ca8c (the breakage on PowerPC) and 
e14112d (the fix). We'll have up to 10,000 commits.

I bisect on an almost daily basis, and i'm not seeing unreasonable 
problems.

	Ingo
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