linux-kernel - [tip:WIP.sched/core 162/162] arch/arm64/kernel/psci.c:48:50: error: implicit declaration of function '_

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Date:   Mon, 6 Feb 2017 09:56:30 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.sched/core 162/162] arch/arm64/kernel/psci.c:48:50: error:
 implicit declaration of function '__pa'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head:   38c7fc1c938c469af27c032bf4eab0c4aaf4eba1
commit: 38c7fc1c938c469af27c032bf4eab0c4aaf4eba1 [162/162] sched/headers: Reduce header dependencies
config: arm64-alldefconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
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
        git checkout 38c7fc1c938c469af27c032bf4eab0c4aaf4eba1
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

All errors (new ones prefixed by >>):

   arch/arm64/kernel/psci.c: In function 'cpu_psci_cpu_boot':
>> arch/arm64/kernel/psci.c:48:50: error: implicit declaration of function '__pa' [-Werror=implicit-function-declaration]
     int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa(secondary_entry));
                                                     ^~~~
   cc1: some warnings being treated as errors

vim +/__pa +48 arch/arm64/kernel/psci.c

00ef54bb Mark Rutland    2013-10-24  32  {
00ef54bb Mark Rutland    2013-10-24  33  	return 0;
00ef54bb Mark Rutland    2013-10-24  34  }
00ef54bb Mark Rutland    2013-10-24  35  
cd1aebf5 Mark Rutland    2013-10-24  36  static int __init cpu_psci_cpu_prepare(unsigned int cpu)
00ef54bb Mark Rutland    2013-10-24  37  {
00ef54bb Mark Rutland    2013-10-24  38  	if (!psci_ops.cpu_on) {
00ef54bb Mark Rutland    2013-10-24  39  		pr_err("no cpu_on method, not booting CPU%d\n", cpu);
00ef54bb Mark Rutland    2013-10-24  40  		return -ENODEV;
00ef54bb Mark Rutland    2013-10-24  41  	}
00ef54bb Mark Rutland    2013-10-24  42  
652af899 Mark Rutland    2013-10-24  43  	return 0;
00ef54bb Mark Rutland    2013-10-24  44  }
00ef54bb Mark Rutland    2013-10-24  45  
652af899 Mark Rutland    2013-10-24  46  static int cpu_psci_cpu_boot(unsigned int cpu)
652af899 Mark Rutland    2013-10-24  47  {
652af899 Mark Rutland    2013-10-24 @48  	int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa(secondary_entry));
652af899 Mark Rutland    2013-10-24  49  	if (err)
288ac26c Vladimir Murzin 2014-02-28  50  		pr_err("failed to boot CPU%d (%d)\n", cpu, err);
652af899 Mark Rutland    2013-10-24  51  
652af899 Mark Rutland    2013-10-24  52  	return err;
00ef54bb Mark Rutland    2013-10-24  53  }
00ef54bb Mark Rutland    2013-10-24  54  
831ccf79 Mark Rutland    2013-10-24  55  #ifdef CONFIG_HOTPLUG_CPU
831ccf79 Mark Rutland    2013-10-24  56  static int cpu_psci_cpu_disable(unsigned int cpu)

:::::: The code at line 48 was first introduced by commit
:::::: 652af899799354049b273af897b798b8f03fdd88 arm64: factor out spin-table boot method

:::::: TO: Mark Rutland <mark.rutland@....com>
:::::: CC: Catalin Marinas <catalin.marinas@....com>

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