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

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Date:   Wed, 11 Nov 2020 08:56:35 +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 13:35]:
> On Tue, Nov 10, 2020 at 1:06 PM Tony Lindgren <tony@...mide.com> wrote:
> 
> > > 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.
> 
> Obviously all SMP hardware is ARMv6K, the only question I raised
> in point "c)" is what we would lose by making ARMv6 (ARM1136r0)
> support and SMP mutually exclusive in a kernel configuration, and
> I suppose the answer remains "testing".

Agreed that is probably the biggest reason to keep it at this point.

Regards,

Tony