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Date:   Thu, 12 May 2022 09:29:27 +0800
From:   kernel test robot <lkp@intel.com>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Hans de Goede <hdegoede@redhat.com>,
        linux-kernel@vger.kernel.org, Tony Luck <tony.luck@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: [pdx86-platform-drivers-x86:review-hans 46/59]
 kernel/stop_machine.c:638:35: error: call to undeclared function
 'cpu_smt_mask'; ISO C99 and later do not support implicit function
 declarations
Message-ID: <202205120904.Gr9HEY5E-lkp@intel.com>
MIME-Version: 1.0
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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git review-hans
head:   57709a27d9744f5af4bbeec3ba3105c6aa1075eb
commit: 104355bf96bb985c40f8f8da43f70b935d59fb61 [46/59] stop_machine: Add stop_core_cpuslocked() for per-core operations
config: hexagon-randconfig-r045-20220509 (https://download.01.org/0day-ci/archive/20220512/202205120904.Gr9HEY5E-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 18dd123c56754edf62c7042dcf23185c3727610f)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/commit/?id=104355bf96bb985c40f8f8da43f70b935d59fb61
        git remote add pdx86-platform-drivers-x86 https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git
        git fetch --no-tags pdx86-platform-drivers-x86 review-hans
        git checkout 104355bf96bb985c40f8f8da43f70b935d59fb61
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

>> kernel/stop_machine.c:638:35: error: call to undeclared function 'cpu_smt_mask'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           const struct cpumask *smt_mask = cpu_smt_mask(cpu);
                                            ^
   kernel/stop_machine.c:638:35: note: did you mean 'cpu_cpu_mask'?
   include/linux/topology.h:250:37: note: 'cpu_cpu_mask' declared here
   static inline const struct cpumask *cpu_cpu_mask(int cpu)
                                       ^
>> kernel/stop_machine.c:638:24: warning: incompatible integer to pointer conversion initializing 'const struct cpumask *' with an expression of type 'int' [-Wint-conversion]
           const struct cpumask *smt_mask = cpu_smt_mask(cpu);
                                 ^          ~~~~~~~~~~~~~~~~~
   1 warning and 1 error generated.


vim +/cpu_smt_mask +638 kernel/stop_machine.c

   635	
   636	int stop_core_cpuslocked(unsigned int cpu, cpu_stop_fn_t fn, void *data)
   637	{
 > 638		const struct cpumask *smt_mask = cpu_smt_mask(cpu);
   639	
   640		struct multi_stop_data msdata = {
   641			.fn = fn,
   642			.data = data,
   643			.num_threads = cpumask_weight(smt_mask),
   644			.active_cpus = smt_mask,
   645		};
   646	
   647		lockdep_assert_cpus_held();
   648	
   649		/* Set the initial state and stop all online cpus. */
   650		set_state(&msdata, MULTI_STOP_PREPARE);
   651		return stop_cpus(smt_mask, multi_cpu_stop, &msdata);
   652	}
   653	EXPORT_SYMBOL_GPL(stop_core_cpuslocked);
   654	

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