linux-kernel - Re: cpumask: fix compat getaffinity

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Message-Id: <201005081800.48240.rusty@rustcorp.com.au>
Date:	Sat, 8 May 2010 18:00:47 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Andi Kleen <andi@...stfloor.org>,
	Ken Werner <ken.werner@....de>
Subject: Re: cpumask: fix compat getaffinity

On Fri, 7 May 2010 10:15:49 pm Arnd Bergmann wrote:
> Commit a45185d2d "cpumask: convert kernel/compat.c" broke
> libnuma, which abuses sched_getaffinity to find out NR_CPUS
> in order to parse /sys/devices/system/node/node*/cpumap.
> 
> On NUMA systems with less than 32 possibly CPUs, the
> current compat_sys_sched_getaffinity now returns '4'
> instead of the actual NR_CPUS/8, which makes libnuma
> bail out when parsing the cpumap.

Really?  AFAICT the cpumap is printed using nr_cpu_ids too.  Can you
give an example of what cpumap is on this system?

Confused,
Rusty.
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