linux-kernel - Re: [PATCH] selftests/rseq: Do not skip !allowed_cpus for mm

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Date: Mon, 22 Jan 2024 13:55:48 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Shuah Khan <skhan@...uxfoundation.org>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
 "Paul E. McKenney" <paulmck@...nel.org>, Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH] selftests/rseq: Do not skip !allowed_cpus for mm_cid

On 2024-01-22 13:43, Shuah Khan wrote:
> On 1/11/24 08:49, Mathieu Desnoyers wrote:
>> Indexing with mm_cid is incompatible with skipping disallowed cpumask,
>> because concurrency IDs are based on a virtual ID allocation which is
>> unrelated to the physical CPU mask.
>>
>> These issues can be reproduced by running the rseq selftests under a
>> taskset which excludes CPU 0, e.g.
>>
>>    taskset -c 10-20 ./run_param_test.sh
>>
>> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
>> Cc: Shuah Khan <shuah@...nel.org>
>> Cc: Peter Zijlstra <peterz@...radead.org>
>> Cc: "Paul E. McKenney" <paulmck@...nel.org>
>> Cc: Boqun Feng <boqun.feng@...il.com>
>> ---
> 
> Hi Mathieu,
> 
> I applied this to linux-kselftest fixes for the next rc.
> 
> Please cc linux-kselftest mailing list on your future patches. This makes
> my workflow easier as it relies on patches going to linux-kselftest 
> patchworks
> project.

Will do, thanks!

Mathieu

> 
> thanks,
> -- Shuah
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com