linux-kernel - Re: [PATCH v2] arm64: entry.S: Do not preempt from IRQ before all cpufeatures are enabled

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Message-ID: <20191015200755.aavtyhq56lewazah@willie-the-truck>
Date:   Tue, 15 Oct 2019 21:07:55 +0100
From:   Will Deacon <will@...nel.org>
To:     James Morse <james.morse@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Julien Thierry <julien.thierry@....com>
Subject: Re: [PATCH v2] arm64: entry.S: Do not preempt from IRQ before all
 cpufeatures are enabled

Hi James,

Patch looks good apart from one thing...

On Tue, Oct 15, 2019 at 06:25:44PM +0100, James Morse wrote:
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 2c2e56bd8913..67a1d86981a9 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -223,6 +223,7 @@ extern long schedule_timeout_uninterruptible(long timeout);
>  extern long schedule_timeout_idle(long timeout);
>  asmlinkage void schedule(void);
>  extern void schedule_preempt_disabled(void);
> +asmlinkage void preempt_schedule_irq(void);

I don't understand the need for this hunk, since we're only calling the
function from C now. Please could you explain?

Will