linux-kernel - [tip:core/urgent 1/1] kernel/smpboot.c:50:20: warning: duplicate 'inline' declaration specifier

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Message-ID: <202107131739.sf3PdEHZ-lkp@intel.com>
Date:   Tue, 13 Jul 2021 17:21:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [tip:core/urgent 1/1] kernel/smpboot.c:50:20: warning: duplicate
 'inline' declaration specifier

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/urgent
head:   e9ba16e68cce2f85e9f5d2eba5c0453f1a741fd2
commit: e9ba16e68cce2f85e9f5d2eba5c0453f1a741fd2 [1/1] smpboot: Mark idle_init() as __always_inlined to work around aggressive compiler un-inlining
config: x86_64-randconfig-a004-20210713 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=e9ba16e68cce2f85e9f5d2eba5c0453f1a741fd2
        git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
        git fetch --no-tags tip core/urgent
        git checkout e9ba16e68cce2f85e9f5d2eba5c0453f1a741fd2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> kernel/smpboot.c:50:20: warning: duplicate 'inline' declaration specifier [-Wduplicate-decl-specifier]
   static inline void __always_inline idle_init(unsigned int cpu)
                      ^
   include/linux/compiler_attributes.h:65:41: note: expanded from macro '__always_inline'
   #define __always_inline                 inline __attribute__((__always_inline__))
                                           ^
   include/linux/compiler_types.h:149:16: note: expanded from macro 'inline'
   #define inline inline __gnu_inline __inline_maybe_unused notrace
                  ^
   1 warning generated.


vim +/inline +50 kernel/smpboot.c

    43	
    44	/**
    45	 * idle_init - Initialize the idle thread for a cpu
    46	 * @cpu:	The cpu for which the idle thread should be initialized
    47	 *
    48	 * Creates the thread if it does not exist.
    49	 */
  > 50	static inline void __always_inline idle_init(unsigned int cpu)
    51	{
    52		struct task_struct *tsk = per_cpu(idle_threads, cpu);
    53	
    54		if (!tsk) {
    55			tsk = fork_idle(cpu);
    56			if (IS_ERR(tsk))
    57				pr_err("SMP: fork_idle() failed for CPU %u\n", cpu);
    58			else
    59				per_cpu(idle_threads, cpu) = tsk;
    60		}
    61	}
    62	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (42582 bytes)