linux-kernel - Re: [tip: irq/core] x86: Select HARDIRQS_SW

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Date:   Thu, 12 Mar 2020 15:02:49 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-tip-commits@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>, x86 <x86@...nel.org>
Subject: Re: [tip: irq/core] x86: Select HARDIRQS_SW_RESEND on x86

On Thu, Mar 12, 2020 at 2:49 PM Hans de Goede <hdegoede@...hat.com> wrote:

[Me]
> > I see that ARM and ARM64 simply just select this. What
> > happens if you do that and why is x86 not selecting it in general?
>
> Erm, "selecting it in general" (well at least on x86) is what
> this patch is doing.

Sorry that I was unclear, what I meant to say is why wasn't
this done ages ago since so many important architectures seem
to have it enabled by default.

I suppose the reason would be something like "firmware/BIOS
should handle that for us" and recently that has started to
break apart and x86 platforms started to be more like ARM?

Yours,
Linus Walleij