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From:   "Richter, Robert" <Robert.Richter@cavium.com>
To:     Matthias Brugger <matthias.bgg@gmail.com>
CC:     Marc Zyngier <marc.zyngier@arm.com>,
        Matthias Brugger <mbrugger@suse.com>,
        "matthias.bgg@kernel.org" <matthias.bgg@kernel.org>,
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Subject: Re: [PATCH] irqchip/gic-v3-its: Add early memory allocation errata
Thread-Topic: [PATCH] irqchip/gic-v3-its: Add early memory allocation errata
Thread-Index: AQHUSn5jXSWA5hACtkm/BATHVar8DKUPyVAAgADVpQCAABtrAIAAEysAgAAIvACAABEfgA==
Date:   Fri, 5 Oct 2018 15:15:14 +0000
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On 05.10.18 16:13:48, Matthias Brugger wrote:
> On 05/10/2018 15:42, Marc Zyngier wrote:
> > On 05/10/18 13:33, Matthias Brugger wrote:

> >> With my distribution head on, I would prefer a solution that does not =
change
> >> FORCE_MAX_ZONEORDER. That's how I came to the idea providing a third s=
olution to
> >> the same problem :)
> >
> > Why is that a problem? What impact does this have on your favourite dis=
tro?
> >
>=20
> The impact is on changing FORCE_MAX_ZONEORDER on an already released kern=
el will
> break Kernel ABI and with that all external modules. I know that's nothin=
g
> upstream cares too much about, but the distros do :)

Wrt upstream, there is no way to do this change without patching the
kernel. Thus, it is impossible to run an unpatched 4k page size kernel
on ThunderX.

-Robert