[linux-stable-rc:linux-4.19.y 443/3865] kernel/rcu/tree.o: warning: objtool: rcu_note_context_switch()+0x662: can't find switch jump table

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

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TO: Nick Desaulniers <ndesaulniers@google.com>
CC: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
CC: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
head:   e80ef2122d5c0531670cb281f5beea2cb469aee1
commit: 1874d3d6ad0b06bab747e36e70d9b2a5aeb3183a [443/3865] tracepoint: Mark __tracepoint_string's __used
config: x86_64-randconfig-a013-20210406 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a46f59a747a7273cc439efaf3b4f98d8b63d2f20)
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/stable/linux-stable-rc.git/commit/?id=1874d3d6ad0b06bab747e36e70d9b2a5aeb3183a
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.19.y
        git checkout 1874d3d6ad0b06bab747e36e70d9b2a5aeb3183a
        # 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@intel.com>

All warnings (new ones prefixed by >>):

   kernel/rcu/tree.c:210:15: warning: no previous prototype for function 'rcu_rnp_online_cpus' [-Wmissing-prototypes]
   unsigned long rcu_rnp_online_cpus(struct rcu_node *rnp)
                 ^
   kernel/rcu/tree.c:210:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned long rcu_rnp_online_cpus(struct rcu_node *rnp)
   ^
   static 
   kernel/rcu/tree.c:346:6: warning: no previous prototype for function 'rcu_dynticks_curr_cpu_in_eqs' [-Wmissing-prototypes]
   bool rcu_dynticks_curr_cpu_in_eqs(void)
        ^
   kernel/rcu/tree.c:346:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool rcu_dynticks_curr_cpu_in_eqs(void)
   ^
   static 
   2 warnings generated.
>> kernel/rcu/tree.o: warning: objtool: rcu_note_context_switch()+0x662: can't find switch jump table

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

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