arch/arm/mach-imx/cpu-imx25.c:40:5: warning: no previous prototype for 'mx25_revision'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4c612826bec1441214816827979b62f84a097e91
commit: a3102fafdce6f150e5a46e1725bb1732f8953a01 ARM: iop32x: enable multiplatform support
date:   5 months ago
config: arm-randconfig-r032-20220826 (https://download.01.org/0day-ci/archive/20220826/202208261020.uj1YdaoI-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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/torvalds/linux.git/commit/?id=a3102fafdce6f150e5a46e1725bb1732f8953a01
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a3102fafdce6f150e5a46e1725bb1732f8953a01
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash arch/arm/mach-imx/ arch/arm/mach-versatile/ drivers/clk/spear/

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/gfp.h:6,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:9,
                    from include/linux/module.h:17,
                    from arch/arm/mach-imx/cpu-imx25.c:8:
   include/linux/mmzone.h: In function '__nr_to_section':
   include/linux/mmzone.h:1404:13: warning: the comparison will always evaluate as 'true' for the address of 'mem_section' will never be NULL [-Waddress]
    1404 |         if (!mem_section[SECTION_NR_TO_ROOT(nr)])
         |             ^
   include/linux/mmzone.h:1390:27: note: 'mem_section' declared here
    1390 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
         |                           ^~~~~~~~~~~
   arch/arm/mach-imx/cpu-imx25.c: At top level:
>> arch/arm/mach-imx/cpu-imx25.c:40:5: warning: no previous prototype for 'mx25_revision' [-Wmissing-prototypes]
      40 | int mx25_revision(void)
         |     ^~~~~~~~~~~~~
--
   In file included from include/linux/swap.h:7,
                    from include/linux/suspend.h:5,
                    from arch/arm/mach-imx/pm-imx25.c:7:
   include/linux/mmzone.h: In function '__nr_to_section':
   include/linux/mmzone.h:1404:13: warning: the comparison will always evaluate as 'true' for the address of 'mem_section' will never be NULL [-Waddress]
    1404 |         if (!mem_section[SECTION_NR_TO_ROOT(nr)])
         |             ^
   include/linux/mmzone.h:1390:27: note: 'mem_section' declared here
    1390 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
         |                           ^~~~~~~~~~~
   arch/arm/mach-imx/pm-imx25.c: At top level:
>> arch/arm/mach-imx/pm-imx25.c:31:13: warning: no previous prototype for 'imx25_pm_init' [-Wmissing-prototypes]
      31 | void __init imx25_pm_init(void)
         |             ^~~~~~~~~~~~~
--
   In file included from include/linux/gfp.h:6,
                    from include/linux/radix-tree.h:12,
                    from include/linux/idr.h:15,
                    from include/linux/kernfs.h:12,
                    from include/linux/sysfs.h:16,
                    from include/linux/kobject.h:20,
                    from include/linux/of.h:17,
                    from arch/arm/mach-versatile/versatile.c:13:
   include/linux/mmzone.h: In function '__nr_to_section':
   include/linux/mmzone.h:1404:13: warning: the comparison will always evaluate as 'true' for the address of 'mem_section' will never be NULL [-Waddress]
    1404 |         if (!mem_section[SECTION_NR_TO_ROOT(nr)])
         |             ^
   include/linux/mmzone.h:1390:27: note: 'mem_section' declared here
    1390 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
         |                           ^~~~~~~~~~~
   arch/arm/mach-versatile/versatile.c: At top level:
>> arch/arm/mach-versatile/versatile.c:56:14: warning: no previous prototype for 'mmc_status' [-Wmissing-prototypes]
      56 | unsigned int mmc_status(struct device *dev)
         |              ^~~~~~~~~~
--
   In file included from include/linux/gfp.h:6,
                    from include/linux/slab.h:15,
                    from include/linux/clkdev.h:12,
                    from drivers/clk/spear/spear3xx_clock.c:13:
   include/linux/mmzone.h: In function '__nr_to_section':
   include/linux/mmzone.h:1404:13: warning: the comparison will always evaluate as 'true' for the address of 'mem_section' will never be NULL [-Waddress]
    1404 |         if (!mem_section[SECTION_NR_TO_ROOT(nr)])
         |             ^
   include/linux/mmzone.h:1390:27: note: 'mem_section' declared here
    1390 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
         |                           ^~~~~~~~~~~
   drivers/clk/spear/spear3xx_clock.c: At top level:
>> drivers/clk/spear/spear3xx_clock.c:390:13: warning: no previous prototype for 'spear3xx_clk_init' [-Wmissing-prototypes]
     390 | void __init spear3xx_clk_init(void __iomem *misc_base, void __iomem *soc_config_base)
         |             ^~~~~~~~~~~~~~~~~


vim +/mx25_revision +40 arch/arm/mach-imx/cpu-imx25.c

d27536c6619221 Jason Liu 2011-08-26  39  
d27536c6619221 Jason Liu 2011-08-26 @40  int mx25_revision(void)

:::::: The code at line 40 was first introduced by commit
:::::: d27536c6619221528114746317def345467a3e80 ARM: mx25: Print silicon revision on boot

:::::: TO: Jason Liu <jason.hui@xxxxxxxxxx>
:::::: CC: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>

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