linux-kernel - Re: [RFC v2] x86: Select HARDIRQS_SW

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Message-ID: <218eb262-011f-0739-8e74-9ca3ef793bb8@redhat.com>
Date:   Wed, 11 Mar 2020 22:49:12 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2] x86: Select HARDIRQS_SW_RESEND on x86

Hi,

On 3/11/20 10:31 PM, Thomas Gleixner wrote:
> Hans de Goede <hdegoede@...hat.com> writes:
>>> I just need to stare at the legacy PIC and the virt stuff.
>>>
>>>> Also maybe we should add a Cc: stable@...r.kernel.org ??? This seems like
>>>> somewhat a big change for that but it does solve some real issues...
>>>
>>> Yes. Let me stare at the couple of weird irqchips which might get
>>> surprised. I'll teach them not to do that :)
>>
>> I know that you are very busy, still I'm wondering is there any progress
>> on this ?
> 
> Bah. That fell through the cracks, but actually I looked at this due to
> the PCI-E AER wreckage. So yes, this is fine, but we want:
> 
>   https://lkml.kernel.org/r/20200306130623.590923677@linutronix.de
>   https://lkml.kernel.org/r/20200306130623.684591280@linutronix.de
> 
> if we want to backport this to stable.

So far I have seen a few, but not a lot of devices which need this, so
I'm not 100% sure what to do here.

Do you consider this change safe / suitable for stable if those 2 patches
are backported and applied first?

Regards,

Hans