linux-kernel - Re: cpumask: fix compat getaffinity

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Message-Id: <201006230900.29779.rusty@rustcorp.com.au>
Date:	Wed, 23 Jun 2010 09:00:29 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Milton Miller <miltonm@....com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: cpumask: fix compat getaffinity

On Wed, 12 May 2010 06:00:45 pm Milton Miller wrote:
> 
> At least for parsing, we need to allocate and parse NR_CPUS until
> all places like arch/powerpc/platforms/pseries/xics.c that compare a
> user-supplied mask to CPUMASK_ALL are eliminated.

Hi, this has been bugging me...

We're OK in this case: cpumask_equal() will only iterate to nr_cpus.  That's
one reason for all the cpumask churn...

I'm about to submit the cpumask shrinkage to Ingo.  I'll cc you...

Cheers,
Rusty.
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