linux-kernel - Re: [PULL] cpumask offstack finalization

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Message-Id: <201102110802.17453.rusty@rustcorp.com.au>
Date:	Fri, 11 Feb 2011 08:02:17 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, anton@...ba.org,
	Mike Travis <travis@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PULL] cpumask offstack finalization

On Thu, 10 Feb 2011 11:14:16 pm Ingo Molnar wrote:
> 
> * Rusty Russell <rusty@...tcorp.com.au> wrote:
> 
> > Hi Ingo,
> > 
> >    A few more obsolete uses of cpumask has crept into the tree; all easily
> > fixed.  This is rebased onto your -tip tree and re-tested; it finally means
> > that we can detect obsolescent (and hence dangerous) cpumask usage when 
> > CONFIG_CPUMASK_OFFSTACK=y.  It finally reduces the actual allocation of
> > cpumask_var_t to the number of cpus we actually have.
> 
> Hm, could we get rid of the obsolete percpu APIs once and for all? The fact that 
> they are still around cause the leakage into new code to begin with.

Yes; it'll be a fair bit of arch churn, but it can be done in stages easily.
I thought about marking them all __deprecated but that just annoys people.

And yes, this is definitely .39+.

Thanks,
Rusty.
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