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Subject: Re: [PATCH V16 11/11] x86,cgroup/intel_rdt : Add a cgroup interface
 to manage Intel cache allocation
To: "Yu, Fenghua" <fenghua.yu@intel.com>,
        Marcelo Tosatti <mtosatti@redhat.com>
References: <1450392376-6397-1-git-send-email-fenghua.yu@intel.com>
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Cc: Luiz Capitulino <lcapitulino@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@linux.intel.com>, Ingo Molnar <mingo@elte.hu>,
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        Peter Zijlstra <peterz@infradead.org>, Tejun Heo <tj@kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>,
        Vikas Shivappa <vikas.shivappa@linux.intel.com>
From: Richard Weinberger <richard@nod.at>
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Date: Mon, 4 Jan 2016 22:47:23 +0100
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Am 04.01.2016 um 22:44 schrieb Yu, Fenghua:
>> From: Richard Weinberger [mailto:richard.weinberger@gmail.com]
>> Sent: Saturday, January 02, 2016 2:54 PM
>> On Mon, Dec 21, 2015 at 6:05 PM, Marcelo Tosatti <mtosatti@redhat.com>
>> wrote:
>>> OK cool hopefully that makes it clear to Fenghua Yu what must be
>>> changed in the patchset.
>>>
>>>>  - http://lkml.iu.edu/hypermail/linux/kernel/1511.0/02375.html
>>
>> ...beating a dead horse but this patch is in -next and breaks the ARCH=um
>> build when enabled.
>>
>>   UPD     include/generated/compile.h
>>   CC      init/version.o
>>   LD      init/built-in.o
>> kernel/built-in.o:(.rodata+0x2920): undefined reference to
>> `intel_rdt_cgrp_subsys'
>> collect2: error: ld returned 1 exit status
>> make: *** [vmlinux] Error 1
> 
> Do you set CONFIG_INTEL_RDT=y?

Yes. My build bot does allyesconfig builds. :)
IIUC the driver does not make sense for UML, does it?

Thanks,
//richard