netdev - Re: [PATCH v3 8/8] lib: test for_each_numa

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Date: Wed, 26 Jul 2023 19:11:01 -0700
From: Yury Norov <yury.norov@...il.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	Saeed Mahameed <saeedm@...dia.com>,
	Pawel Chmielewski <pawel.chmielewski@...el.com>,
	Leon Romanovsky <leon@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>,
	Tariq Toukan <tariqt@...dia.com>, Gal Pressman <gal@...dia.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heiko Carstens <hca@...ux.ibm.com>, Barry Song <baohua@...nel.org>
Subject: Re: [PATCH v3 8/8] lib: test for_each_numa_cpus()

On Sat, Jul 22, 2023 at 08:47:16AM -0700, Guenter Roeck wrote:
> Hi,
> 
> On Sun, Apr 30, 2023 at 10:18:09AM -0700, Yury Norov wrote:
> > Test for_each_numa_cpus() output to ensure that:
> >  - all CPUs are picked from NUMA nodes with non-decreasing distances to the
> >    original node; 
> >  - only online CPUs are enumerated;
> >  - the macro enumerates each online CPUs only once;
> >  - enumeration order is consistent with cpumask_local_spread().
> > 
> > The latter is an implementation-defined behavior. If cpumask_local_spread()
> > or for_each_numa_cpu() will get changed in future, the subtest may need
> > to be adjusted or even removed, as appropriate.
> > 
> > It's useful now because some architectures don't implement numa_distance(),
> > and generic implementation only distinguishes local and remote nodes, which
> > doesn't allow to test the for_each_numa_cpu() properly.
> > 
> 
> This patch results in a crash when testing sparc64 images with qemu.

Thanks Guenter for reporting. I'll remove the series until fixing the
issue.

Thanks,
Yury