linux-kernel - Re: Loongson (and other $ARCHs?) idle VS timer enqueue

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Message-ID: <87pm7x0ylc.ffs@tglx>
Date:   Fri, 21 Apr 2023 22:28:15 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Loongson (and other $ARCHs?) idle VS timer enqueue

On Fri, Apr 21 2023 at 18:55, Frederic Weisbecker wrote:
> On Fri, Apr 21, 2023 at 05:24:36PM +0200, Thomas Gleixner wrote:
>> It's far from trivial because you'd need correlation between the
>> interrupt entry and the enter to and return from arch_cpu_idle().
>> 
>> I fear manual inspection is the main tool here :(
>
> I thought so :)
>
> I'm already halfway through the architectures, then will come the cpuidle drivers...

For objtool covered architectures you might come up with some annotation
which allows objtool to yell, when it discovers a local_irq_enable() or
such at the wrong place.

Thanks,

        tglx