linux-kernel - Re: [PATCH 2/3] arm: introduce IRQ stacks

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Date:   Tue, 10 Nov 2020 14:04:22 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        v.narang@...sung.com, a.sahrawat@...sung.com,
        Marc Zyngier <maz@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nathan Huckleberry <nhuck@...gle.com>,
        Jian Cai <caij2003@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Maninder Singh <maninder1.s@...sung.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] arm: introduce IRQ stacks

* Arnd Bergmann <arnd@...nel.org> [201110 10:04]:
> On Tue, Nov 10, 2020 at 10:19 AM Tony Lindgren <tony@...mide.com> wrote:
> > * Arnd Bergmann <arnd@...nel.org> [201109 19:10]:
> > > On Mon, Nov 9, 2020 at 3:45 PM Tony Lindgren <tony@...mide.com> wrote:
> > >
> > > I know it works, my point was that I'm not sure anyone cares
> > > any more ;-)
> >
> > Well for example whatever Linux running ARMv6 LTE modems out there might
> > need to be supported for quite some time. Not sure how many of them are
> > able to update kernels though. Certainly network security related issues
> > would be a good reason to update the kernels.
> 
> While I agree they should update their kernels, I suspect none of those
> modems do. I am however certain that none of them are running an
> SMP-enabled multiplatform kernel on an ARM1136r0!

Nope, AFAIK all the SMP parts are ARMv6K :)

> Are these actually ARMv6? Most ARM11 cores you'd come across
> in practice are ARMv6K (ARM1136r1, ARM1167, ARM11MPCore),
> in particular every SoC that has any mainline support except for
> the ARM1136r0 based OMAP2 and i.MX3.

I've been only using smp_on_up for the ARMv6 ARM1136r0 variants
for omap2, no SMP on those.

Regards,

Tony