Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems

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To: Will Deacon <will@xxxxxxxxxx>
Subject: Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Wed, 18 Aug 2021 13:06:08 +0200
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Catalin Marinas <catalin.marinas@xxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Morten Rasmussen <morten.rasmussen@xxxxxxx>, Qais Yousef <qais.yousef@xxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Quentin Perret <qperret@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Juri Lelli <juri.lelli@xxxxxxxxxx>, Vincent Guittot <vincent.guittot@xxxxxxxxxx>, "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>, Dietmar Eggemann <dietmar.eggemann@xxxxxxx>, Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>, Valentin Schneider <valentin.schneider@xxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, kernel-team@xxxxxxxxxxx
In-reply-to: <20210818104227.GA13828@willie-the-truck>
References: <20210730112443.23245-1-will@kernel.org> <20210730112443.23245-9-will@kernel.org> <YRvRfZ/NnuNyIu3s@hirez.programming.kicks-ass.net> <20210818104227.GA13828@willie-the-truck>

On Wed, Aug 18, 2021 at 11:42:28AM +0100, Will Deacon wrote:

> Ah, sorry. I didn't realise you couldn't _free_ with a raw lock held in RT.
> Is there somewhere I can read up on that?

It's because the allocators use spinlock_t, which cannot nest inside
raw_spinlock_t.

References:
- [PATCH v11 00/16] Add support for 32-bit tasks on asymmetric AArch32 systems
  - From: Will Deacon
- [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems
  - From: Will Deacon
- Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems
  - From: Peter Zijlstra
- Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems
  - From: Will Deacon

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