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From: Greg KH <gregkh@linuxfoundation.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Anson Huang <anson.huang@nxp.com>,
	John Stultz <john.stultz@linaro.org>,
	Russell King <linux@armlinux.org.uk>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Sascha Hauer <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	"oleksandr.suvorov@toradex.com" <oleksandr.suvorov@toradex.com>,
	Adam Ford <aford173@gmail.com>,
	Andreas Kemnade <andreas@kemnade.info>,
	"hverkuil-cisco@xs4all.nl" <hverkuil-cisco@xs4all.nl>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Leo Li <leoyang.li@nxp.com>, Vinod Koul <vkoul@kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	dl-linux-imx <linux-imx@nxp.com>, Jon Corbet <corbet@lwn.net>,
	Olof Johansson <olof@lixom.net>,
	Kevin Hilman <khilman@baylibre.com>
Subject: Re: [PATCH 1/3] gpio: mxc: Support module build
Date: Fri, 17 Jul 2020 16:13:44 +0200	[thread overview]
Message-ID: <20200717141344.GA2992942@kroah.com> (raw)
In-Reply-To: <CAK8P3a3fwwx-2gQTXZ9dbko+DuLELGm=nKrYFXfwcJJOf0Xz5g@mail.gmail.com>

On Fri, Jul 17, 2020 at 03:54:49PM +0200, Arnd Bergmann wrote:
> > 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 :)
> 
> Can you give a specific example? The only problem I'm aware of for
> those SoCs is drivers being outside of the mainline kernel. Clearly
> having support for loadable modules helps SoC vendors because it
> allows them to support a new platform with an existing binary kernel
> by shipping third-party driver modules, but for stuff that is already
> in mainline, we could in theory support all hardware in a single gigantic
> binary kernel with no support for loadable modules at all.

That did not work for many drivers for some reason, look at all the work
Saravana had to do in the driver core and device tree code for it to
happen correctly over the past year.

thanks,

greg k-h

WARNING: multiple messages have this Message-ID (diff)
From: Greg KH <gregkh@linuxfoundation.org>
To: Arnd Bergmann <arnd@arndb.de>
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>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	dl-linux-imx <linux-imx@nxp.com>,
	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 16:13:44 +0200	[thread overview]
Message-ID: <20200717141344.GA2992942@kroah.com> (raw)
In-Reply-To: <CAK8P3a3fwwx-2gQTXZ9dbko+DuLELGm=nKrYFXfwcJJOf0Xz5g@mail.gmail.com>

On Fri, Jul 17, 2020 at 03:54:49PM +0200, Arnd Bergmann wrote:
> > 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 :)
> 
> Can you give a specific example? The only problem I'm aware of for
> those SoCs is drivers being outside of the mainline kernel. Clearly
> having support for loadable modules helps SoC vendors because it
> allows them to support a new platform with an existing binary kernel
> by shipping third-party driver modules, but for stuff that is already
> in mainline, we could in theory support all hardware in a single gigantic
> binary kernel with no support for loadable modules at all.

That did not work for many drivers for some reason, look at all the work
Saravana had to do in the driver core and device tree code for it to
happen correctly over the past year.

thanks,

greg k-h

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-07-17 14:13 UTC|newest]

Thread overview: 42+ 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 ` 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   ` Anson Huang
2020-07-07 23:25 ` [PATCH 3/3] ARM: imx_v6_v7_defconfig: " Anson Huang
2020-07-07 23:25   ` Anson Huang
2020-07-10 11:16   ` Andreas Kemnade
2020-07-10 11:16     ` Andreas Kemnade
2020-07-10 13:29     ` Anson Huang
2020-07-10 13:29       ` Anson Huang
2020-07-11 21:17 ` [PATCH 1/3] gpio: mxc: Support module build Linus Walleij
2020-07-11 21:17   ` Linus Walleij
2020-07-12  1:34   ` Anson Huang
2020-07-12  1:34     ` Anson Huang
2020-07-15  2:44     ` Anson Huang
2020-07-15  2:44       ` Anson Huang
2020-07-16 13:54       ` Linus Walleij
2020-07-16 13:54         ` Linus Walleij
2020-07-16 14:37         ` Anson Huang
2020-07-16 14:37           ` Anson Huang
2020-07-17 12:01           ` Linus Walleij
2020-07-17 12:01             ` Linus Walleij
2020-07-17 12:14             ` Greg KH
2020-07-17 12:14               ` Greg KH
2020-07-17 12:27               ` Geert Uytterhoeven
2020-07-17 12:27                 ` Geert Uytterhoeven
2020-07-17 13:21                 ` Greg KH
2020-07-17 13:21                   ` Greg KH
2020-07-17 13:54                   ` Arnd Bergmann
2020-07-17 13:54                     ` Arnd Bergmann
2020-07-17 14:13                     ` Greg KH [this message]
2020-07-17 14:13                       ` Greg KH
2020-07-17 15:36                       ` Mark Brown
2020-07-17 15:36                         ` Mark Brown
2020-07-17 13:02               ` Arnd Bergmann
2020-07-17 13:02                 ` Arnd Bergmann
2020-07-17 13:23                 ` Greg KH
2020-07-17 13:23                   ` Greg KH
2020-07-17 13:44               ` Linus Walleij
2020-07-17 13:44                 ` Linus Walleij
2020-07-21  0:04             ` John Stultz
2020-07-21  0:04               ` John Stultz

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