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

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Date:	Tue, 13 Aug 2013 21:45:36 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Rob Herring <robherring2@...il.com>
Cc:	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 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.

> 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.

Thanks,
Rafael

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