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From:   Thomas Gleixner <tglx@linutronix.de>
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To:     Valentin Schneider <valentin.schneider@arm.com>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rt-users@vger.kernel.org
Cc:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        Joel Fernandes <joel@joelfernandes.org>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Steven Price <steven.price@arm.com>,
        Ard Biesheuvel <ardb@kernel.org>
Subject: Re: [PATCH 0/3] sched: migrate_disable() vs per-CPU access safety checks
In-Reply-To: <20210721115118.729943-1-valentin.schneider@arm.com>
References: <20210721115118.729943-1-valentin.schneider@arm.com>
Date:   Tue, 27 Jul 2021 21:45:07 +0200
Message-ID: <87tukfpmm4.ffs@nanos.tec.linutronix.de>
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On Wed, Jul 21 2021 at 12:51, Valentin Schneider wrote:
> Hi folks,
>
> I've hit a few warnings when taking v5.13-rt1 out for a spin on my arm64
> Juno. Those are due to regions that become preemptible under PREEMPT_RT, but
> remain safe wrt per-CPU accesses due to migrate_disable() + a sleepable lock.
>
> This adds a helper that looks at not just preemptability but also affinity and
> migrate disable, and plasters the warning sites.

Nice!

I just pulled that into the RT queue and it will show up with the next
release.

Thanks,

        tglx