[intel-linux-intel-lts:5.4/preempt-rt 15/16] kernel/printk/printk.c:2014:5: warning: no previous prototype for function 'vprintk_default'

[kernel test robot <lkp@intel.com>]

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tree:   https://github.com/intel/linux-intel-lts.git 5.4/preempt-rt
head:   2046457bf9f4a420f69e915453d59db5b38edbaa
commit: 3c3f9863f8b96ccbf6fd420c93f1685f6085651a [15/16] Merge tag 'lts-v5.4.58-yocto-200825T002733Z' into lts2019/yocto-rt
config: arm64-randconfig-r005-20210610 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d2012d965d60c3258b3a69d024491698f8aec386)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel/linux-intel-lts/commit/3c3f9863f8b96ccbf6fd420c93f1685f6085651a
        git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-linux-intel-lts 5.4/preempt-rt
        git checkout 3c3f9863f8b96ccbf6fd420c93f1685f6085651a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> kernel/printk/printk.c:2014:5: warning: no previous prototype for function 'vprintk_default' [-Wmissing-prototypes]
   int vprintk_default(const char *fmt, va_list args)
       ^
   kernel/printk/printk.c:2014:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int vprintk_default(const char *fmt, va_list args)
   ^
   static 
   1 warning generated.
--
>> kernel/rcu/srcutree.c:739:30: warning: unused variable 'sp_llock' [-Wunused-const-variable]
   static DEFINE_LOCAL_IRQ_LOCK(sp_llock);
                                ^
   1 warning generated.
--
   lib/radix-tree.c:301:6: warning: no previous prototype for function 'radix_tree_node_rcu_free' [-Wmissing-prototypes]
   void radix_tree_node_rcu_free(struct rcu_head *head)
        ^
   lib/radix-tree.c:301:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void radix_tree_node_rcu_free(struct rcu_head *head)
   ^
   static 
>> lib/radix-tree.c:75:30: warning: unused variable 'radix_tree_preloads_lock' [-Wunused-const-variable]
   static DEFINE_LOCAL_IRQ_LOCK(radix_tree_preloads_lock);
                                ^
   2 warnings generated.
--
>> mm/swap.c:56:30: warning: unused variable 'rotate_lock' [-Wunused-const-variable]
   static DEFINE_LOCAL_IRQ_LOCK(rotate_lock);
                                ^
   1 warning generated.
--
   mm/page_alloc.c:6098:23: warning: no previous prototype for function 'memmap_init' [-Wmissing-prototypes]
   void __meminit __weak memmap_init(unsigned long size, int nid,
                         ^
   mm/page_alloc.c:6098:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __meminit __weak memmap_init(unsigned long size, int nid,
   ^
   static 
>> mm/page_alloc.c:361:30: warning: unused variable 'pa_lock' [-Wunused-const-variable]
   static DEFINE_LOCAL_IRQ_LOCK(pa_lock);
                                ^
   2 warnings generated.
--
>> mm/memcontrol.c:96:30: warning: unused variable 'event_lock' [-Wunused-const-variable]
   static DEFINE_LOCAL_IRQ_LOCK(event_lock);
                                ^
   mm/memcontrol.c:1010:43: warning: unused function 'get_mem_cgroup_from_current' [-Wunused-function]
   static __always_inline struct mem_cgroup *get_mem_cgroup_from_current(void)
                                             ^
   2 warnings generated.
--
>> mm/zsmalloc.c:500:30: warning: unused variable 'zs_map_area_lock' [-Wunused-const-variable]
   static DEFINE_LOCAL_IRQ_LOCK(zs_map_area_lock);
                                ^
   1 warning generated.


vim +/vprintk_default +2014 kernel/printk/printk.c

^1da177e4c3f41 kernel/printk.c        Linus Torvalds           2005-04-16  2013  
a0cba2179ea4c1 kernel/printk/printk.c Linus Torvalds           2016-08-09 @2014  int vprintk_default(const char *fmt, va_list args)
afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  2015) {
afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  2016) 	int r;
afdc34a3d3b823 kernel/printk/printk.c Steven Rostedt (Red Hat  2014-06-19  2017) 

:::::: The code at line 2014 was first introduced by commit
:::::: a0cba2179ea4c1820fce2ee046b6ed90ecc56196 Revert "printk: create pr_<level> functions"

:::::: TO: Linus Torvalds <torvalds@linux-foundation.org>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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

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