linux-kernel - Re: [PATCH v7 6/6] pci: Add support for creating a generic host

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Message-ID: <20140408130920.GY17163@e106497-lin.cambridge.arm.com>
Date:	Tue, 8 Apr 2014 14:09:20 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	linux-pci <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	Tanmay Inamdar <tinamdar@....com>
Subject: Re: [PATCH v7 6/6] pci: Add support for creating a generic
 host_bridge from device tree

Hi Hanjun,

On Tue, Apr 08, 2014 at 01:57:54PM +0100, Hanjun Guo wrote:
> Hi Liviu,
> 
> On 2014-3-14 23:34, Liviu Dudau wrote:
> > Several platforms use a rather generic version of parsing
> > the device tree to find the host bridge ranges. Move the common code
> > into the generic PCI code and use it to create a pci_host_bridge
> > structure that can be used by arch code.
> > 
> > Based on early attempts by Andrew Murray to unify the code.
> > Used powerpc and microblaze PCI code as starting point.
> > 
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> > Tested-by: Tanmay Inamdar <tinamdar@....com>
> > ---
> >  drivers/pci/host-bridge.c | 158 ++++++++++++++++++++++++++++++++++++
> >  include/linux/pci.h       |  13 +++
> >  2 files changed, 171 insertions(+)
> > 
> > diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> > index 8708b652..7cda90b 100644
> > --- a/drivers/pci/host-bridge.c
> > +++ b/drivers/pci/host-bridge.c
> > @@ -6,9 +6,14 @@
> >  #include <linux/init.h>
> >  #include <linux/pci.h>
> >  #include <linux/module.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_pci.h>
> > +#include <linux/slab.h>
> >  
> >  #include "pci.h"
> >  
> > +static atomic_t domain_nr = ATOMIC_INIT(-1);
> 
> domain_nr will only be used inside the #ifdef CONFIG_OF,
> and this will lead to compile warning which complains that
> 'domain_nr' defined but not used when CONFIG_OF=n (for example
> on x86).
> 
> How about moving the definition to --->
> 
> > +
> >  static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
> >  {
> >  	while (bus->parent)
> > @@ -92,3 +97,156 @@ void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
> >  	res->end = region->end + offset;
> >  }
> >  EXPORT_SYMBOL(pcibios_bus_to_resource);
> > +
> > +#ifdef CONFIG_OF
> 
> here?

I've already moved the definition there in my refresh.

Thanks for reviewing the code,
Liviu

> 
> Thanks
> Hanjun
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯

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