linux-kernel - Re: 3.12 merge window exynos cpufreq driver fails to build

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Date:	Wed, 4 Sep 2013 11:08:15 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Tomasz Figa <t.figa@...sung.com>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	cpufreq@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Peter Robinson <pbrobinson@...il.com>
Subject: Re: 3.12 merge window exynos cpufreq driver fails to build

On Wed, Sep 4, 2013 at 11:04 AM, Tomasz Figa <t.figa@...sung.com> wrote:
> On Wednesday 04 of September 2013 10:41:31 Josh Boyer wrote:
>> On Wed, Sep 4, 2013 at 10:36 AM, Tomasz Figa <t.figa@...sung.com> wrote:
>> > Hi Josh,
>> >
>> > On Wednesday 04 of September 2013 10:13:16 Josh Boyer wrote:
>> >> Using Linus' tree as of this morning (v3.11-2654-g458c3f6), the
>> >> exynos-cpufreq driver doesn't build because it includes a file that
>> >> doesn't exist.
>> >>
>> >> + make -s ARCH=arm V=1 -j4 bzImage KALLSYMS_EXTRA_PASS=1
>> >> arch/arm/kernel/return_address.c:63:2: warning: #warning "TODO:
>> >> return_address should use unwind tables" [-Wcpp]
>> >>
>> >>  #warning "TODO: return_address should use unwind tables"
>> >>
>> >>   ^
>> >>
>> >> arch/arm/mm/dma-mapping.c:253:2: warning: #warning ARM Coherent DMA
>> >> allocator does not (yet) support huge TLB [-Wcpp]
>> >>
>> >>  #warning ARM Coherent DMA allocator does not (yet) support huge TLB
>> >>
>> >>   ^
>> >>
>> >> drivers/cpufreq/exynos-cpufreq.c:21:22: fatal error: plat/cpu.h: No
>> >> such file or directory
>> >>
>> >>  #include <plat/cpu.h>
>> >>
>> >>                       ^
>> >>
>> >> compilation terminated.
>> >> make[2]: *** [drivers/cpufreq/exynos-cpufreq.o] Error 1
>> >>
>> >> I'm guessing that <plat/cpu.h> file is supposed to come from
>> >> arch/arm/plat-samsung/include/plat/, but I don't see anything that
>> >> specifies a -I there.
>> >>
>> >> Thoughts?
>> >
>> > Could you attach config that could be used to trigger this? Thanks in
>> > advance.
>>
>> Attached.
>
> Hmm, this does not look like config for kernel neither from Linus' nor
> linux-next tree. The first thing I can see is CONFIG_ARCH_EXYNOS_MULTI
> selected, which is not available in any mainline tree.

Sigh.  Yes, I see the issue now.

> As for the build error itself, headers from plat/ are available for drivers
> only in single platform builds, they can't be included when multiplatform
> is enabled. The exynos-cpufreq driver is not multiplatform-aware yet and so
> you get the failure.

Someone added some exynos multiplatform patches to the Fedora kernel.
That seems to have caused these build failures.  Our mistake and my
apologies for the inconvenience.  Thank you for the quick response.

josh
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