linux-kernel - Re: Regression with commit f9cde5f in 2.6.30-gitX

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Date:	Wed, 24 Jun 2009 22:03:39 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Gary Hade <garyhade@...ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Larry Finger <Larry.Finger@...inger.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>, Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Regression with commit f9cde5f in 2.6.30-gitX

On Wed, 2009-06-24 at 09:13 -0700, Gary Hade wrote:
> On Wed, Jun 24, 2009 at 09:27:48PM +0530, Jaswinder Singh Rajput wrote:
> > On Wed, 2009-06-24 at 17:19 +0200, Thomas Gleixner wrote:
> > > Larry,
> > > 
> > > On Wed, 24 Jun 2009, Larry Finger wrote:
> > > > For the record, the printout from the patch results in the following:
> > > > 
> > > > PCI: Failed to allocate 0xd0000-0xd3fff from PCI mem for PCI Bus 0000:00
> > > > PCI: Failed to allocate 0xec000-0xeffff from PCI mem for PCI Bus
> > > > 0000:00 due to _CRS returning more than 13 resource descriptors
> > > > PCI: Failed to allocate 0xf0000-0xfffff from PCI mem for PCI Bus
> > > > 0000:00 due to _CRS returning more than 13 resource descriptors
> > > > PCI: Failed to allocate 0xc0000000-0xfebfffff from PCI mem for PCI Bus
> > > > 0000:00 due to _CRS returning more than 13 resource descriptors
> > > 
> > > can you please the patch below instead of the other one ?
> > > 
> > > Thanks,
> > > 
> > > 	tglx
> > > ---
> > > diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
> > > index 16c3fda..39a0cce 100644
> > > --- a/arch/x86/pci/acpi.c
> > > +++ b/arch/x86/pci/acpi.c
> > > @@ -99,7 +99,6 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
> > >  			"%d resource descriptors\n", (unsigned long) res->start,
> > >  			(unsigned long) res->end, root->name, info->name,
> > >  			max_root_bus_resources);
> > > -		info->res_num++;
> > >  		return AE_OK;
> > >  	}
> > >  
> > 
> > This fails and system does not boot, I already tested this patch 8 hours
> > ago.
> 
> I think the resource array needs to be larger.  Can you try
> the below patch?
> 
> Gary
> 
> --- linux-2.6.30-rc8/include/linux/pci.h.ORIG	2009-06-24 09:03:41.000000000 -0700
> +++ linux-2.6.30-rc8/include/linux/pci.h	2009-06-24 09:06:50.000000000 -0700
> @@ -319,7 +319,7 @@ static inline void pci_add_saved_cap(str
>  }
>  
>  #ifndef PCI_BUS_NUM_RESOURCES
> -#define PCI_BUS_NUM_RESOURCES	16
> +#define PCI_BUS_NUM_RESOURCES	20
>  #endif
>  
>  #define PCI_REGION_FLAG_MASK	0x0fU	/* These bits of resource flags tell us the PCI region flags */


Larry already suggested PCI_BUS_NUM_RESOURCES to 24 in his patch (check
first reply from him).

Then what is the point of removing last 3 and then adding 3 or more
resources, so patch f9cde5f lost its purpose, best case will be to
revert f9cde5f as it also removed :

if (info->res_num >= PCI_BUS_NUM_RESOURCES)
                return AE_OK;

which is required in any case.

Thanks,
--
JSR




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