linux-kernel - Re: [GIT PULL] DT/core: cpu

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Message-ID: <520B4C76.8020900@arm.com>
Date:	Wed, 14 Aug 2013 10:23:02 +0100
From:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Rob Herring <robherring2@...il.com>,
	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Olof Johansson <olof@...om.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [GIT PULL] DT/core: cpu_ofnode updates for v3.12

On 13/08/13 20:45, Rafael J. Wysocki wrote:
> On Tuesday, August 13, 2013 01:44:23 PM Rob Herring wrote:
>> On Tue, Aug 13, 2013 at 10:40 AM, Sudeep KarkadaNagesha
>> <Sudeep.KarkadaNagesha@....com> wrote:
>>> Adding PowerPC list
>>>
>>> On 13/08/13 14:00, Rafael J. Wysocki wrote:
>>>> On Monday, August 12, 2013 02:27:47 PM Sudeep KarkadaNagesha wrote:
>>>>> The following changes since commit
>>>>> d4e4ab86bcba5a72779c43dc1459f71fea3d89c8:
>>>>>
>>>>> Linux 3.11-rc5 (2013-08-11 18:04:20 -0700)
>>>>>
>>>>> are available in the git repository at:
>>>>>
>>>>> git://linux-arm.org/linux-skn.git cpu_of_node
>>
>> [snip]
>>
>>>> All error/warnings:
>>>>
>>>> warning: (MPC836x_RDK && MTD_NAND_FSL_ELBC && MTD_NAND_FSL_UPM)
>>>> selects FSL_LBC which has unmet direct dependencies (FSL_SOC)
>>>> warning: (MPC836x_RDK && MTD_NAND_FSL_ELBC && MTD_NAND_FSL_UPM)
>>>> selects FSL_LBC which has unmet direct dependencies (FSL_SOC)
>>>> In file included from arch/powerpc/include/asm/kvm_para.h:26:0, from
>>>> include/uapi/linux/kvm_para.h:26, from include/linux/kvm_para.h:4,
>>>> from include/linux/kvm_host.h:30, from
>>>> arch/powerpc/kernel/asm-offsets.c:53:
>>>> include/linux/of.h:269:28: error: conflicting types for
>>>> 'of_get_cpu_node'
>>>> extern struct device_node *of_get_cpu_node(int cpu); ^ In file
>>>> included from include/linux/of.h:139:0, from
>>>> arch/powerpc/include/asm/kvm_para.h:26, from
>>>> include/uapi/linux/kvm_para.h:26, from include/linux/kvm_para.h:4,
>>>> from include/linux/kvm_host.h:30, from
>>>> arch/powerpc/kernel/asm-offsets.c:53:
>>>> arch/powerpc/include/asm/prom.h:47:21: note: previous declaration
>>>> of 'of_get_cpu_node' was here
>>>> struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
>>>> ^ make[2]: *** [arch/powerpc/kernel/asm-offsets.s] Error 1 make[2]:
>>>> Target `__build' not remade because of errors. make[1]: ***
>>>> [prepare0] Error 2 make[1]: Target `prepare' not remade because of
>>>> errors. make: *** [sub-make] Error 2
>>>>
>>>
>>> There seems to be conflict in the new function "of_get_cpu_node" added.
>>> PowerPC also defines the same function name. Further microblaze and
>>> openrisc declares it(can be removed) but doesn't define it.
>>> To fix this:
>>> 1. I can rename the newly added function to something different like
>>>    `of_get_cpunode` or
>>> 2. If of_* namespace should be used by only OF/FDT and not by any
>>>    architecture specific code, then the arch specific version can be
>>>    renamed to some thing like arch_of_get_cpu_node.
>>>    Also most of the calls to arch specific function can be moved to
>>>    generic code.
>>>
>>> Let me know your thoughts.
>>
>> It is up to Rafael if he is willing/able to rebase his tree, but I
>> would drop this series until this is sorted out.
> 
> Yeah, I've just done that.
> 
Thanks Rafael, sorry for the trouble. I didn't expect of_* name-space to
be used in ARCH specific code.

>> I think the new common function should be and can be generalized to work for
>> powerpc.
>> It would need to make reg property optional and pass in the device
>> node to the arch specific function.
>>
>> A short term solution would be just to make the function "#ifndef CONFIG_PPC".
> 
> I wouldn't do that, it's almost guaranteed to be messy going forward.
> 
> I'd go for 1 above personally.

Even though it's easier approach, I would go for fixing PPC and converge
at generic of_get_cpu_node implementation if possible.

Regards,
Sudeep



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