From: Arnd Bergmann <arnd@arndb.de>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-kernel@vger.kernel.org, stable@kernel.org,
Andi Kleen <andi@firstfloor.org>, Ken Werner <ken.werner@web.de>
Subject: Re: cpumask: fix compat getaffinity
Date: Sat, 8 May 2010 11:11:08 +0200 [thread overview]
Message-ID: <201005081111.08720.arnd@arndb.de> (raw)
In-Reply-To: <201005081800.48240.rusty@rustcorp.com.au>
On Saturday 08 May 2010 10:30:47 Rusty Russell wrote:
>
> 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?
On Ken's PS3 running the Fedora 12 kernel (2.6.32-something), the output
from my memory is 00000000,00000000,00000000,00000003\n. NR_CPUs
is 128, nr_cpu_ids is most likely 2.
Arnd
next prev parent reply other threads:[~2010-05-08 9:11 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-07 12:45 Arnd Bergmann
2010-05-08 8:30 ` Rusty Russell
2010-05-08 9:11 ` Arnd Bergmann [this message]
2010-05-10 23:43 ` Rusty Russell
2010-05-11 1:47 ` KOSAKI Motohiro
2010-05-11 3:13 ` [stable] " Greg KH
2010-05-11 5:51 ` Rusty Russell
2010-05-11 6:25 ` KOSAKI Motohiro
2010-05-11 6:20 ` KOSAKI Motohiro
2010-05-11 15:20 ` Greg KH
2010-05-11 18:13 ` Arnd Bergmann
2010-05-11 21:36 ` Greg KH
2010-05-12 8:30 ` Milton Miller
2010-05-14 12:39 ` Rusty Russell
2010-05-17 6:04 ` KOSAKI Motohiro
2010-05-17 18:58 ` Arnd Bergmann
2010-05-18 0:57 ` Rusty Russell
2010-12-14 16:59 ` Josh Hunt
2010-12-15 14:40 ` Arnd Bergmann
2010-06-22 23:30 ` Rusty Russell
2010-05-11 9:05 ` Arnd Bergmann
2010-05-12 0:52 ` KOSAKI Motohiro
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