From: Greg KH <gregkh@linuxfoundation.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Linus Walleij <linus.walleij@linaro.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
"oleksandr.suvorov@toradex.com" <oleksandr.suvorov@toradex.com>,
Fabio Estevam <festevam@gmail.com>,
Anson Huang <anson.huang@nxp.com>, Jon Corbet <corbet@lwn.net>,
Will Deacon <will@kernel.org>, Olof Johansson <olof@lixom.net>,
Russell King <linux@armlinux.org.uk>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Andreas Kemnade <andreas@kemnade.info>,
dl-linux-imx <linux-imx@nxp.com>, Arnd Bergmann <arnd@arndb.de>,
Sascha Hauer <s.hauer@pengutronix.de>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
John Stultz <john.stultz@linaro.org>,
Adam Ford <aford173@gmail.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Leo Li <leoyang.li@nxp.com>, Vinod Koul <vkoul@kernel.org>,
Sascha Hauer <kernel@pengutronix.de>,
Kevin Hilman <khilman@baylibre.com>,
"hverkuil-cisco@xs4all.nl" <hverkuil-cisco@xs4all.nl>,
Shawn Guo <shawnguo@kernel.org>
Subject: Re: [PATCH 1/3] gpio: mxc: Support module build
Date: Fri, 17 Jul 2020 15:21:01 +0200 [thread overview]
Message-ID: <20200717132101.GA2984939@kroah.com> (raw)
In-Reply-To: <CAMuHMdWdaQ_jK1T_ErJ36pJbUUS3SFBcqQmyvtufaKha2C76Gg@mail.gmail.com>
On Fri, Jul 17, 2020 at 02:27:43PM +0200, Geert Uytterhoeven wrote:
> Hi Greg,
>
> On Fri, Jul 17, 2020 at 2:14 PM Greg KH <gregkh@linuxfoundation.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?
For many many SoCs today, this is not true. Their drivers are required
to be built in and will not work as modules, as we are seeing the
patches try to fix.
> 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).
I think the confusion here is that this really does not work well, if at
all, on most "high end" SoC chips due to the collection of different
things all of the vendors ship to their customers. This is the work
that is trying to be fixed up here.
And look at the driver core work for many driver subsystems to be fixed
up just to get a single kernel image to work on multiple platforms.
Just because older ones did it, doesn't mean it actually works today :)
thanks,
greg k-h
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-07-17 13:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 23:25 [PATCH 1/3] gpio: mxc: Support module build Anson Huang
2020-07-07 23:25 ` [PATCH 2/3] arm64: defconfig: Build in CONFIG_GPIO_MXC by default Anson Huang
2020-07-07 23:25 ` [PATCH 3/3] ARM: imx_v6_v7_defconfig: " Anson Huang
2020-07-10 11:16 ` Andreas Kemnade
2020-07-10 13:29 ` Anson Huang
2020-07-11 21:17 ` [PATCH 1/3] gpio: mxc: Support module build Linus Walleij
2020-07-12 1:34 ` Anson Huang
2020-07-15 2:44 ` Anson Huang
2020-07-16 13:54 ` Linus Walleij
2020-07-16 14:37 ` Anson Huang
2020-07-17 12:01 ` Linus Walleij
2020-07-17 12:14 ` Greg KH
2020-07-17 12:27 ` Geert Uytterhoeven
2020-07-17 13:21 ` Greg KH [this message]
2020-07-17 13:54 ` Arnd Bergmann
2020-07-17 14:13 ` Greg KH
2020-07-17 15:36 ` Mark Brown
2020-07-17 13:02 ` Arnd Bergmann
2020-07-17 13:23 ` Greg KH
2020-07-17 13:44 ` Linus Walleij
2020-07-21 0:04 ` John Stultz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200717132101.GA2984939@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=aford173@gmail.com \
--cc=andreas@kemnade.info \
--cc=anson.huang@nxp.com \
--cc=arnd@arndb.de \
--cc=bgolaszewski@baylibre.com \
--cc=bjorn.andersson@linaro.org \
--cc=catalin.marinas@arm.com \
--cc=corbet@lwn.net \
--cc=festevam@gmail.com \
--cc=geert@linux-m68k.org \
--cc=hverkuil-cisco@xs4all.nl \
--cc=john.stultz@linaro.org \
--cc=kernel@pengutronix.de \
--cc=khilman@baylibre.com \
--cc=leoyang.li@nxp.com \
--cc=linus.walleij@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-imx@nxp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=oleksandr.suvorov@toradex.com \
--cc=olof@lixom.net \
--cc=s.hauer@pengutronix.de \
--cc=shawnguo@kernel.org \
--cc=vkoul@kernel.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).