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[PATCH 03/10] drivers/pci: make host/pci-mvebu.c explicitly non-modular

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  [PATCH 03/10] drivers/pci: make host/pci-mvebu.c explicitly non-modular Paul Gortmaker <paul.gortmaker@windriver.com> - 2015-12-13 02:50 +0100
    Re: [PATCH 03/10] drivers/pci: make host/pci-mvebu.c explicitly  non-modular Thomas Petazzoni <thomas.petazzoni@free-electrons.com> - 2015-12-13 11:40 +0100
    Re: [PATCH 03/10] drivers/pci: make host/pci-mvebu.c explicitly non-modular Arnd Bergmann <arnd@arndb.de> - 2015-12-14 10:00 +0100

#1290523 — [PATCH 03/10] drivers/pci: make host/pci-mvebu.c explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/pci/host/Kconfig:config PCI_MVEBU
drivers/pci/host/Kconfig:       bool "Marvell EBU PCIe controller"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_platform_driver() uses the same init level priority as
builtin_platform_driver() the init ordering remains unchanged with
this commit.

We don't have to disallow a driver unbind, since that is already
done for us in this driver.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

We also delete the MODULE_LICENSE tag etc. since all that information
was (or is now ) contained at the top of the file in the comments.

Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 drivers/pci/host/pci-mvebu.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index 53b79c5f0559..17222f1a3ef3 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -1,6 +1,8 @@
 /*
  * PCIe driver for Marvell Armada 370 and Armada XP SoCs
  *
+ * Module Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
  * This file is licensed under the terms of the GNU General Public
  * License version 2.  This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
@@ -11,7 +13,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/gpio.h>
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/mbus.h>
 #include <linux/msi.h>
 #include <linux/slab.h>
@@ -1296,7 +1298,6 @@ static const struct of_device_id mvebu_pcie_of_match_table[] = {
 	{ .compatible = "marvell,kirkwood-pcie", },
 	{},
 };
-MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
 
 static struct dev_pm_ops mvebu_pcie_pm_ops = {
 	.suspend_noirq = mvebu_pcie_suspend,
@@ -1313,8 +1314,4 @@ static struct platform_driver mvebu_pcie_driver = {
 	},
 	.probe = mvebu_pcie_probe,
 };
-module_platform_driver(mvebu_pcie_driver);
-
-MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
-MODULE_DESCRIPTION("Marvell EBU PCIe driver");
-MODULE_LICENSE("GPL v2");
+builtin_platform_driver(mvebu_pcie_driver);
-- 
2.6.1

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#1290602 — Re: [PATCH 03/10] drivers/pci: make host/pci-mvebu.c explicitly non-modular

Paul,

On Sat, 12 Dec 2015 20:41:50 -0500, Paul Gortmaker wrote:
> The Kconfig currently controlling compilation of this code is:
> 
> drivers/pci/host/Kconfig:config PCI_MVEBU
> drivers/pci/host/Kconfig:       bool "Marvell EBU PCIe controller"
> 
> ...meaning that it currently is not being built as a module by anyone.
> 
> Lets remove the modular code that is essentially orphaned, so that
> when reading the driver there is no doubt it is builtin-only.
> 
> Since module_platform_driver() uses the same init level priority as
> builtin_platform_driver() the init ordering remains unchanged with
> this commit.
> 
> We don't have to disallow a driver unbind, since that is already
> done for us in this driver.
> 
> Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.
> 
> We also delete the MODULE_LICENSE tag etc. since all that information
> was (or is now ) contained at the top of the file in the comments.
> 
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Jason Cooper <jason@lakedaemon.net>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> ---
>  drivers/pci/host/pci-mvebu.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)

I think the general direction should rather be to change the PCI
subsystem to make it possible for those drivers to be built as modules.
However, since this is quite certainly a much larger effort, there is
no reason to not clean things up as they are today, so:

Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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#1290987

On Saturday 12 December 2015 20:41:50 Paul Gortmaker wrote:
> The Kconfig currently controlling compilation of this code is:
> 
> drivers/pci/host/Kconfig:config PCI_MVEBU
> drivers/pci/host/Kconfig:       bool "Marvell EBU PCIe controller"
> 
> ...meaning that it currently is not being built as a module by anyone.

Here too. I think we should really try to let all PCI host drivers be
loadable modules if possible. The module unload path is currently
a bit iffy because of the way it interacts with the arch/arm PCI
infrastructure, but we are in the process of fixing it.

For now, I think allowing all PCIe host drivers for ARM to be
loadable but non-removably modules would be ideal.

	Arnd
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