linux-kernel - Re: [tip:irq/urgent] genirq: Make legacy autoprobing work again

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Date:   Thu, 1 Feb 2018 10:56:13 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Meelis Roos <mroos@...ux.ee>,
        Ingo Molnar <mingo@...nel.org>,
        linux-tip-commits@...r.kernel.org,
        kbuild test robot <fengguang.wu@...el.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [tip:irq/urgent] genirq: Make legacy autoprobing work again

On Thu, 1 Feb 2018, Geert Uytterhoeven wrote:
> On Wed, Jan 31, 2018 at 10:54 AM, tip-bot for Thomas Gleixner
> > -void irq_activate_and_startup(struct irq_desc *desc, bool resend)
> > +int irq_activate_and_startup(struct irq_desc *desc, bool resend)
> >  {
> >         if (WARN_ON(irq_activate(desc)))
> >                 return;
> 
> As reported by 0day, this should return something.
> 
> if CONFIG_IRQ_DOMAIN=n or CONFIG_IRQ_DOMAIN_HIERARCHY=n,
> irq_activate() will never return 1, and the code path can be eliminated.
> 
> BTW, is gcc becoming too smart, and already eliminating code before it
> generates warnings for it? Recently I've seen some other cases where buggy
> code was not warned about, as it was considered not having any impact.

Looks like. Fixed it up.

Thanks,

	tglx