Re: [PATCH 0/2] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build - Russell King

From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>, Stephen Boyd <sboyd@kernel.org>,
	Kevin Cernekee <cernekee@gmail.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Doug Berger <opendmb@gmail.com>,
	Gregory Fong <gregory.0xf0@gmail.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 0/2] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build
Date: Tue, 2 Jun 2020 13:22:47 +0100	[thread overview]
Message-ID: <20200602122247.GV1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <CAMuHMdViAcnaPzeD6cS8U-uzjZARGyf0dqaiehevn+DwCNid5Q@mail.gmail.com>

On Tue, Jun 02, 2020 at 02:18:48PM +0200, Geert Uytterhoeven wrote:
> Hi Russell,
> 
> On Thu, May 21, 2020 at 4:50 PM Russell King - ARM Linux admin
> <linux@armlinux.org.uk> wrote:
> > On Thu, May 21, 2020 at 05:07:45PM +0300, Mike Rapoport wrote:
> > > Ah, when either of these patforms will become a part of the
> > > multiplatform build, the only option for multiplatform build will be
> > > sparsemem.
> > > So it would be nice if somebody could check the cost of using sparsemem
> > > vs flatmem, espessially on low end machines.
> >
> > Do you think they will become part of multiplatform?
> >
> > If they're low-end machines, then adding:
> >
> > (a) the additional memory overhead of a multiplatform kernel
> > (b) the additional runtime overhead of the complexities of multiplatform
> >     kernels
> >
> > is surely an odd thing to do, especially when few really care about
> > these platforms becoming part of a multiplatform kernel, except those
> > who like the idea of multiplat.
> 
> The fallacy of "multi-platform", again?
> 
> Isn't it a requirement for any new ARM v7-A platforms to be part of
> ARCH_MULTI_V7, even if it's a low-end machine?

What does ARMv7 have to do with this thread, that is discussing the
older ARMv4 platforms? I find your comments above irrelevent to
this discussion, and seems to be worded to provoke a reaction.

Not playing.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC for 0.8m (est. 1762m) line in suburbia: sync at 13.1Mbps down 424kbps up

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