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

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Message-ID: <52300F59.3070605@linux.vnet.ibm.com>
Date:	Wed, 11 Sep 2013 12:06:09 +0530
From:	Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Benjamin Herrenschmidt <benh@....ibm.com>,
	Asai Thambi S P <asamymuthupa@...ron.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shivaprasad G Bhat <sbhat@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: powerpc allmodconfig build broken due to commit 15863ff3b (powerpc:
 Make chip-id information available to userspace)

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
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>

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