linux-kernel - Re: [PATCH -next] smp: Move stub from main.c into smp.h

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Date:   Sat, 28 May 2022 20:26:57 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yue Zou <zouyue3@...wei.com>, sfr@...b.auug.org.au,
        akpm@...ux-foundation.org, mhiramat@...nel.org,
        rostedt@...dmis.org, ahalaney@...hat.com, vbabka@...e.cz,
        Jason@...c4.com, mark-pk.tsai@...iatek.com,
        linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org
Subject: Re: [PATCH -next] smp: Move stub from main.c into smp.h

Hi Yue,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20220527]

url:    https://github.com/intel-lab-lkp/linux/commits/Yue-Zou/smp-Move-stub-from-main-c-into-smp-h/20220528-185146
base:    d3fde8ff50ab265749704bd7fbcf70d35235421f
config: x86_64-randconfig-a013 (https://download.01.org/0day-ci/archive/20220528/202205282032.H8Urbl9N-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/2efe286bd89edfa5448d29a5be89fd54df424c46
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Yue-Zou/smp-Move-stub-from-main-c-into-smp-h/20220528-185146
        git checkout 2efe286bd89edfa5448d29a5be89fd54df424c46
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 prepare

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:62,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:6,
                    from include/linux/slab.h:15,
                    from include/linux/crypto.h:20,
                    from arch/x86/kernel/asm-offsets.c:9:
>> include/linux/smp.h:186:27: warning: 'setup_max_cpus' defined but not used [-Wunused-const-variable=]
     186 | static const unsigned int setup_max_cpus = NR_CPUS;
         |                           ^~~~~~~~~~~~~~
--
   fs/d_path.c:318:7: warning: no previous prototype for 'simple_dname' [-Wmissing-prototypes]
     318 | char *simple_dname(struct dentry *dentry, char *buffer, int buflen)
         |       ^~~~~~~~~~~~
   In file included from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:62,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/uapi/linux/aio_abi.h:31,
                    from include/linux/syscalls.h:77,
                    from fs/d_path.c:2:
>> include/linux/smp.h:186:27: warning: 'setup_max_cpus' defined but not used [-Wunused-const-variable=]
     186 | static const unsigned int setup_max_cpus = NR_CPUS;
         |                           ^~~~~~~~~~~~~~
--
   fs/io_uring.c: In function '__io_submit_flush_completions':
   fs/io_uring.c:3152:40: warning: variable 'prev' set but not used [-Wunused-but-set-variable]
    3152 |         struct io_wq_work_node *node, *prev;
         |                                        ^~~~
   In file included from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:62,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from include/uapi/linux/aio_abi.h:31,
                    from include/linux/syscalls.h:77,
                    from fs/io_uring.c:45:
   At top level:
>> include/linux/smp.h:186:27: warning: 'setup_max_cpus' defined but not used [-Wunused-const-variable=]
     186 | static const unsigned int setup_max_cpus = NR_CPUS;
         |                           ^~~~~~~~~~~~~~
--
   In file included from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:62,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:6,
                    from include/linux/slab.h:15,
                    from include/linux/crypto.h:20,
                    from arch/x86/kernel/asm-offsets.c:9:
>> include/linux/smp.h:186:27: warning: 'setup_max_cpus' defined but not used [-Wunused-const-variable=]
     186 | static const unsigned int setup_max_cpus = NR_CPUS;
         |                           ^~~~~~~~~~~~~~


vim +/setup_max_cpus +186 include/linux/smp.h

   185	
 > 186	static const unsigned int setup_max_cpus = NR_CPUS;
   187	static inline void setup_nr_cpu_ids(void) { }
   188	static inline void smp_prepare_cpus(unsigned int maxcpus) { }
   189	

-- 
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