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Date:	Mon, 26 Feb 2007 09:26:44 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>, Jeff Garzik <jgarzik@...ox.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.20-rc4-mm1: PCI=n: drivers/net/3c59x.c compile error

On Mon, 26 Feb 2007 16:22:27 +0300 Sergei Shtylyov wrote:

> Hello, I wrote:
> 
> >>>> 3x59x-fix-pci-resource-management.patch causes the following compile 
> >>>> error with CONFIG_PCI=n:
> 
> >>>> <--  snip  -->
> 
> >>>> ...
> >>>>   CC      drivers/net/3c59x.o
> >>>> /home/bunk/linux/kernel-2.6/linux-2.6.20-rc4-mm1/drivers/net/3c59x.c: 
> >>>> In function 'vortex_init_one':
> >>>> /home/bunk/linux/kernel-2.6/linux-2.6.20-rc4-mm1/drivers/net/3c59x.c:961: 
> >>>> error: implicit declaration of function 'pci_request_regions'
> >>>> /home/bunk/linux/kernel-2.6/linux-2.6.20-rc4-mm1/drivers/net/3c59x.c:985: 
> >>>> error: implicit declaration of function 'pci_release_regions'
> >>>> make[3]: *** [drivers/net/3c59x.o] Error 1
> 
> >>>    Grr, at at the same time it's happy with pci_enable_device().
> >>>    I'd say the problem is in <linux/pci.h>,  not in the patch.
> 
> >>    Has there been any patch to fix the "unbalanced" 
> >> pci_{request|release}_regions() declarations? Am I suposed to create 
> >> such?
> 
> >    Alternatively, vortex_{init|remove_one() and struct pci_driver there 
> > could have been put under #ifdef CONFIG_PCI (good idea anyway -- should 
> > reduce driver size on non-PCI systems)...
> 
>     I wonder if I may count on any feedback on this -- asking linux-pci now...
>     The issue is as follows: with my patch pci_{request|release}_regions() may 
> be called with CONFIG_PCI=n (probably, this never has been a issue before) but 
> <linux/pci.h> don't have them declared in this case -- unlike 
> pci_enable_device() which is just empty for CONFIG_PCI=n.
>     Now, what kind of approach do I take:
> 
> - a "fair one", so that pci_{request|release}_regions() get "balanced"
>    declarations in the header like pci_enable_device();
> 
> - a "local one" (and even saving non-PCI kernel from needless bloat), i.e.
>    #ifdef out functions that are only meaningful with CONFIG_PCI=y)?
> 
>     I'm leaning to the second now...

I'd prefer the fair one -- add stubs to include/linux/pci.h.

---
~Randy
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