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

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Date:   Tue, 10 Nov 2020 11:04:06 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
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

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!

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.

        Arnd