tree:   https://github.com/ammarfaizi2/linux-block viro/vfs/work.elfcore
head:   a3dc8a83c1058a934c52202bfaff2206e573e761
commit: 5d2db800a27b1fb81bd03f02a4c6fa7046352be8 [7/10] [elf][non-regset] uninline elf_core_copy_task_fpregs() (and lose pt_regs argument)
config: um-i386_defconfig
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/5d2db800a27b1fb81bd03f02a4c6fa7046352be8
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block viro/vfs/work.elfcore
        git checkout 5d2db800a27b1fb81bd03f02a4c6fa7046352be8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

   arch/um/kernel/process.c:50:5: warning: no previous prototype for 'pid_to_processor_id' [-Wmissing-prototypes]
      50 | int pid_to_processor_id(int pid)
         |     ^~~~~~~~~~~~~~~~~~~
   arch/um/kernel/process.c:86:7: warning: no previous prototype for '__switch_to' [-Wmissing-prototypes]
      86 | void *__switch_to(struct task_struct *from, struct task_struct *to)
         |       ^~~~~~~~~~~
   arch/um/kernel/process.c: In function 'new_thread_handler':
   arch/um/kernel/process.c:121:28: warning: variable 'n' set but not used [-Wunused-but-set-variable]
     121 |         int (*fn)(void *), n;
         |                            ^
   arch/um/kernel/process.c: At top level:
   arch/um/kernel/process.c:139:6: warning: no previous prototype for 'fork_handler' [-Wmissing-prototypes]
     139 | void fork_handler(void)
         |      ^~~~~~~~~~~~
   arch/um/kernel/process.c:216:6: warning: no previous prototype for 'arch_cpu_idle' [-Wmissing-prototypes]
     216 | void arch_cpu_idle(void)
         |      ^~~~~~~~~~~~~
   arch/um/kernel/process.c:253:5: warning: no previous prototype for 'copy_to_user_proc' [-Wmissing-prototypes]
     253 | int copy_to_user_proc(void __user *to, void *from, int size)
         |     ^~~~~~~~~~~~~~~~~
   arch/um/kernel/process.c:263:5: warning: no previous prototype for 'clear_user_proc' [-Wmissing-prototypes]
     263 | int clear_user_proc(void __user *buf, int size)
         |     ^~~~~~~~~~~~~~~
   arch/um/kernel/process.c:316:12: warning: no previous prototype for 'make_proc_sysemu' [-Wmissing-prototypes]
     316 | int __init make_proc_sysemu(void)
         |            ^~~~~~~~~~~~~~~~
   arch/um/kernel/process.c:356:15: warning: no previous prototype for 'arch_align_stack' [-Wmissing-prototypes]
     356 | unsigned long arch_align_stack(unsigned long sp)
         |               ^~~~~~~~~~~~~~~~
>> arch/um/kernel/process.c:396:5: warning: no previous prototype for 'elf_core_copy_task_fpregs' [-Wmissing-prototypes]
     396 | int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/elf_core_copy_task_fpregs +396 arch/um/kernel/process.c

   395	
 > 396	int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
   397	{
   398		int cpu = current_thread_info()->cpu;
   399	
   400		return save_i387_registers(userspace_pid[cpu], (unsigned long *) fpu);
   401	}
   402	

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