Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Valentin Schneider <valentin.schneider@arm.com>
To:     Alexey Kardashevskiy <aik@ozlabs.ru>,
        Guenter Roeck <linux@roeck-us.net>,
        Frederic Weisbecker <frederic@kernel.org>
Cc:     linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org,
        Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, x86@kernel.org
Subject: Re: [tip: sched/core] sched/core: Initialize the idle task with preemption disabled
In-Reply-To: <de7b1d0f-8767-1b33-2950-576029c0d9f7@ozlabs.ru>
References: <20210512094636.2958515-1-valentin.schneider@arm.com> <162081815405.29796.14574924529325899839.tip-bot2@tip-bot2> <20210706194456.GA1823793@roeck-us.net> <87fswr6lqv.mognet@arm.com> <20210707120305.GB115752@lothringen> <87czru727k.mognet@arm.com> <c30097f3-63b4-6fa0-a369-8f4e20ee1040@roeck-us.net> <de7b1d0f-8767-1b33-2950-576029c0d9f7@ozlabs.ru>
Date:   Wed, 07 Jul 2021 15:57:17 +0100
Message-ID: <878s2i6uk2.mognet@arm.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

On 08/07/21 00:35, Alexey Kardashevskiy wrote:
> On 08/07/2021 00:14, Guenter Roeck wrote:
>>
>> Can you reproduce the problem with a powerpc qemu emulation ?
>> If so, how do you reproduce it there ? Reason for asking is that I don't
>> see
>> the problem with any of my powerpc emulations, and I would like to add test
>> case(s) if possible.
>
> I can reproduce the problem on powerpc easily - qemu with "-smp 2" does it.
>

So on powerpc I'm chasing a slightly different problem, reported at
[1]. I couldn't get it to trigger on qemu for powerpc64, and I'm still
struggling with powerpc. Could you please share you qemu invocation &
kernel .config? Thanks.

[1]: https://lore.kernel.org/linux-next/YNSq3UQTjm6HWELA@in.ibm.com/

>
> --
> Alexey