linux-kernel - Re: [PATCH v5 1/4] PCI: Export symbols of PCI functions

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Message-ID: <20150310205651.GA32204@google.com>
Date:	Tue, 10 Mar 2015 15:56:51 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Ray Jui <rjui@...adcom.com>
Cc:	Arnd Bergmann <arnd@...db.de>, Hauke Mehrtens <hauke@...ke-m.de>,
	Paul Bolle <pebolle@...cali.nl>,
	Florian Fainelli <f.fainelli@...il.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazau <anatol@...gle.com>,
	Scott Branden <sbranden@...adcom.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 1/4] PCI: Export symbols of PCI functions

On Mon, Mar 09, 2015 at 05:38:03PM -0700, Ray Jui wrote:
> Export symbols of the following PCI functions so they can be referenced
> by a PCI driver compiled as a kernel loadable module:
> 
> pci_common_swizzle
> pci_create_root_bus
> pci_stop_root_bus
> pci_remove_root_bus
> pci_assign_unassigned_bus_resources
> pci_fixup_irqs

Have you tested your driver as a loadable module?

If it works to load/unload/reload/etc., I'm OK with exporting these
symbols.  I would prefer EXPORT_SYMBOL_GPL, though, because these don't
constitute a very coherent interface right now, and they will likely be
reworked.  For example, see Yijing Wang's work to sort out the
pci_bus_add_devices() / resource assignment mess.

Bjorn

> Signed-off-by: Ray Jui <rjui@...adcom.com>
> ---
>  drivers/pci/pci.c       |    1 +
>  drivers/pci/probe.c     |    1 +
>  drivers/pci/remove.c    |    2 ++
>  drivers/pci/setup-bus.c |    1 +
>  drivers/pci/setup-irq.c |    1 +
>  5 files changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 81f06e8..fb4a3da 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -2492,6 +2492,7 @@ u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp)
>  	*pinp = pin;
>  	return PCI_SLOT(dev->devfn);
>  }
> +EXPORT_SYMBOL(pci_common_swizzle);
>  
>  /**
>   *	pci_release_region - Release a PCI bar
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 8d2f400..eb24ef9 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1993,6 +1993,7 @@ err_out:
>  	kfree(b);
>  	return NULL;
>  }
> +EXPORT_SYMBOL(pci_create_root_bus);
>  
>  int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
>  {
> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> index 8bd76c9..c523159 100644
> --- a/drivers/pci/remove.c
> +++ b/drivers/pci/remove.c
> @@ -139,6 +139,7 @@ void pci_stop_root_bus(struct pci_bus *bus)
>  	/* stop the host bridge */
>  	device_release_driver(&host_bridge->dev);
>  }
> +EXPORT_SYMBOL(pci_stop_root_bus);
>  
>  void pci_remove_root_bus(struct pci_bus *bus)
>  {
> @@ -158,3 +159,4 @@ void pci_remove_root_bus(struct pci_bus *bus)
>  	/* remove the host bridge */
>  	device_unregister(&host_bridge->dev);
>  }
> +EXPORT_SYMBOL(pci_remove_root_bus);
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index e3e17f3..932c9e5 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -1750,3 +1750,4 @@ void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
>  	__pci_bus_assign_resources(bus, &add_list, NULL);
>  	BUG_ON(!list_empty(&add_list));
>  }
> +EXPORT_SYMBOL(pci_assign_unassigned_bus_resources);
> diff --git a/drivers/pci/setup-irq.c b/drivers/pci/setup-irq.c
> index 4e2d595..9d2bbb6 100644
> --- a/drivers/pci/setup-irq.c
> +++ b/drivers/pci/setup-irq.c
> @@ -65,3 +65,4 @@ void pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *),
>  	for_each_pci_dev(dev)
>  		pdev_fixup_irq(dev, swizzle, map_irq);
>  }
> +EXPORT_SYMBOL(pci_fixup_irqs);
> -- 
> 1.7.9.5
> 
--
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