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Message-ID: <e33279b2-be4d-4706-8faf-9cf5e8c8e092@efficios.com>
Date: Mon, 22 Jan 2024 13:55:48 -0500
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Subject: Re: [PATCH] selftests/rseq: Do not skip !allowed_cpus for mm_cid
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To: Shuah Khan <skhan@linuxfoundation.org>, Shuah Khan <shuah@kernel.org>
Cc: linux-kernel@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
 "Paul E. McKenney" <paulmck@kernel.org>, Boqun Feng <boqun.feng@gmail.com>
References: <20240111154922.600919-1-mathieu.desnoyers@efficios.com>
 <40935ea7-9da6-455d-8df3-94e7e0fc6fa4@linuxfoundation.org>
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
In-Reply-To: <40935ea7-9da6-455d-8df3-94e7e0fc6fa4@linuxfoundation.org>
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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@efficios.com>
>> Cc: Shuah Khan <shuah@kernel.org>
>> Cc: Peter Zijlstra <peterz@infradead.org>
>> Cc: "Paul E. McKenney" <paulmck@kernel.org>
>> Cc: Boqun Feng <boqun.feng@gmail.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