linux-kernel - Re: [PATCH v3 2/4] sched: Introduce migratable()

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Message-ID: <YfzwycgvDlVSGrB1@linutronix.de>
Date:   Fri, 4 Feb 2022 10:24:25 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        rcu@...r.kernel.org, linux-rt-users@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Steven Price <steven.price@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mike Galbraith <efault@....de>
Subject: Re: [PATCH v3 2/4] sched: Introduce migratable()

On 2022-01-27 19:27:56 [+0000], Valentin Schneider wrote:

Sorry, got distracted.

> While I'm at it, I see you're still carrying
> 
>   6ab5bb09040d arm64/sve: Make kernel FPU protection RT friendly
> 
> If you're OK with it, I'll repost that:
> https://lore.kernel.org/lkml/20210722175157.1367122-1-valentin.schneider@arm.com/

I'm not too keen about preempt_enable_bh(). I would prefer the current
approach maybe with a comment why BH here and preemption there is
correct.
 
Sebastian