linux-kernel - Re: [PATCH 01/31] cpumask: Documentation

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Date:	Thu, 2 Oct 2008 11:32:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Mike Travis <travis@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/31] cpumask: Documentation


* Rusty Russell <rusty@...tcorp.com.au> wrote:

> > IMHO, an infrastructure change of this magnitude should absolutely 
> > be done via the Git space. This needs a ton of testing and needs 
> > bisection, a real Git track record, etc.
> 
> Not yet.  Committing untested patches into git is the enemy of 
> bisection; if one of my patches breaks an architecture, they lose the 
> ability to bisect until its fixed.  If it's a series of patches, we 
> can go back and fix it.

while the initial series might be rebased once or twice, beyond the 1-2 
days of initial integration and testing i dont think that's true, and 
i'm doing up to 3-4 bisections a day just fine, on an append-mostly 
tree.

if you have trouble turning a Git tree into a bisectable tree then your 
testing-fu is not strong enough ;-)

[ the only plausible danger is to architectures that are not used by 
  testers all that much (so that breakages can linger a lot longer 
  unnoticed) - but why should the other 99% of Linux users be put at a 
  disadvantage for them. ]

	Ingo
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