linux-kernel - Re: [PATCH 1/3] gpio: mxc: Support module build

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Date:   Fri, 17 Jul 2020 14:27:43 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Anson Huang <anson.huang@....com>,
        John Stultz <john.stultz@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "oleksandr.suvorov@...adex.com" <oleksandr.suvorov@...adex.com>,
        Adam Ford <aford173@...il.com>,
        Andreas Kemnade <andreas@...nade.info>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Leo Li <leoyang.li@....com>, Vinod Koul <vkoul@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>, Jon Corbet <corbet@....net>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH 1/3] gpio: mxc: Support module build

Hi Greg,

On Fri, Jul 17, 2020 at 2:14 PM Greg KH <gregkh@...uxfoundation.org> wrote:
> Android is just finally pushing vendors to get their code upstream,
> which is a good thing to see.  And building things as a module is an
> even better thing as now it is finally allowing arm64 systems to be
> built to support more than one specific hardware platform at runtime.

Can you please stop spreading this FUD?

As I said before, Arm64 kernels have supported more than one specific
hardware platform at runtime from the beginning of the arm64 port
(assumed the needed platform support has been enabled in the kernel
 config, of course).
Even most arm32 kernels support this, since the introduction of the
CONFIG_ARCH_MULTIPLATFORM option.  In fact every recently
introduced arm32 platform is usually v7, and must conform to this.
The sole exceptions are very old platforms, and the v4/v5/v6/v7 split
due to architectural issues (the latter still support clusters of
platforms in a single kernel).

Thank you, and have a nice weekend!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds