Re: powerpc allmodconfig build broken due to commit 15863ff3b (powerpc:Make chip-id information available to userspace)

[Vasant Hegde]

On 09/11/2013 04:20 AM, Guenter Roeck wrote:
> On Wed, Sep 11, 2013 at 08:02:49AM +1000, Benjamin Herrenschmidt wrote:
> > On Mon, 2013-09-09 at 16:55 -0700, Asai Thambi S P wrote:
> > > On 09/08/2013 5:28 PM, Guenter Roeck wrote:
> > > > Hi all,

Guenter, Ben,

Sorry for the inconvenience. I never realized my patch could break somewhere :-(

Thanks you very much for identifying and fixing this issue. Other patch looks 
good to me.

-Vasant


> > > > powerpc allmodconfig build on the latest upstream kernel results in:
> > > >
> > > > ERROR: ".cpu_to_chip_id" [drivers/block/mtip32xx/mtip32xx.ko] undefined!
> > > >
> > > > This is due to commit 15863ff3b (powerpc: Make chip-id information
> > > > available to userspace).
> > > > Not surprising, as cpu_to_chip_id() is not exported.
> > > Apart from the above error, I have a concern on the patch, purely based on the commit message.
> > > (to be honest, I am not familiar with the ppc architecture)
> > >
> > > Commit message of 15863ff3b has the following text.
> > >
> > > ******************
> > > So far "/sys/devices/system/cpu/cpuX/topology/physical_package_id"
> > > was always default (-1) on ppc64 architecture.
> > >
> > > Now, some systems have an ibm,chip-id property in the cpu nodes in
> > > the device tree. On these systems, we now use this information to
> > > display physical_package_id
> > > ******************
> > >
> > > Shouldn't the new definition of "topology_physical_package_id" apply only to those systems supporting ibm,chip-id property?
> >
> > There should be no negative side effect (appart from the missing
> > EXPORT_SYMBOL of course). If the property is not found in the
> > device-tree, the new function returns -1, so it should work fine on all
> > systems.
> Good. I submitted a patch doing just that yesterday or so.
> Hope you'll accept it ;).
>
> Thanks,
> Guenter
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