linux-kernel - Re: [PATCH v8 7/7] powerpc/perf: nest pmu cpumask and cpu hotplug support

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Date:	Tue, 1 Mar 2016 04:13:51 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>,
	Daniel Axtens <dja@...ens.net>,
	Stephane Eranian <eranian@...gle.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Preeti U Murthy <preetium@...rew.cmu.edu>
Subject: Re: [PATCH v8 7/7] powerpc/perf: nest pmu cpumask and cpu hotplug
 support

Hi Madhavan,

[auto build test ERROR on v4.5-rc5]
[also build test ERROR on next-20160229]
[cannot apply to powerpc/next]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Madhavan-Srinivasan/powerpc-powernv-Nest-Instrumentation-support/20160223-120036
config: powerpc-maple_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   arch/powerpc/perf/nest-pmu.c: In function 'nest_exit_cpu':
>> arch/powerpc/perf/nest-pmu.c:82:12: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
     l_cpumask = cpumask_of_node(nid);
               ^
   arch/powerpc/perf/nest-pmu.c: In function 'nest_init_cpu':
   arch/powerpc/perf/nest-pmu.c:101:12: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
     l_cpumask = cpumask_of_node(nid);
               ^
   cc1: all warnings being treated as errors

vim +/const +82 arch/powerpc/perf/nest-pmu.c

    76	
    77		/*
    78		 * Now that this cpu is one of the designated,
    79		 * find a next cpu a) which is online and b) in same chip.
    80		 */
    81		nid = cpu_to_node(cpu);
  > 82		l_cpumask = cpumask_of_node(nid);
    83		target = cpumask_next(cpu, l_cpumask);
    84	
    85		/*

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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