[tip:core/entry 2/3] arch/s390/include/asm/entry-common.h:49:18: error: call to undeclared function 'task_stack_page'; ISO C99 and later do not support implicit function declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/entry
head:   34ef6308418f138395a664bf9f5d80ace9825ac6
commit: 7fc04d7044aaa5ffe2afe78979fe6ddd5da24f10 [2/3] syscall_user_dispatch: Make it configurable in Kconfig
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260708/[email protected]/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 0a2fb2a2269da0e2a3e230beb6cad39ca314db33)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260708/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   In file included from arch/s390/kernel/traps.c:24:
   In file included from include/linux/entry-common.h:5:
>> arch/s390/include/asm/entry-common.h:49:18: error: call to undeclared function 'task_stack_page'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      49 |         pai_kernel_exit(current_pt_regs());
         |                         ^
   include/linux/ptrace.h:389:27: note: expanded from macro 'current_pt_regs'
     389 | #define current_pt_regs() task_pt_regs(current)
         |                           ^
   arch/s390/include/asm/processor.h:252:10: note: expanded from macro 'task_pt_regs'
     252 |         (task_stack_page(tsk) + THREAD_SIZE) - 1)
         |          ^
   In file included from arch/s390/kernel/traps.c:24:
   In file included from include/linux/entry-common.h:8:
   In file included from include/linux/irq-entry-common.h:9:
   In file included from include/linux/syscalls.h:95:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:10:
   In file included from include/linux/perf_event.h:50:
   In file included from include/linux/perf_regs.h:5:
   include/linux/sched/task_stack.h:21:30: error: conflicting types for 'task_stack_page'
      21 | static __always_inline void *task_stack_page(const struct task_struct *task)
         |                              ^
   arch/s390/include/asm/entry-common.h:49:18: note: previous implicit declaration is here
      49 |         pai_kernel_exit(current_pt_regs());
         |                         ^
   include/linux/ptrace.h:389:27: note: expanded from macro 'current_pt_regs'
     389 | #define current_pt_regs() task_pt_regs(current)
         |                           ^
   arch/s390/include/asm/processor.h:252:10: note: expanded from macro 'task_pt_regs'
     252 |         (task_stack_page(tsk) + THREAD_SIZE) - 1)
         |          ^
   2 errors generated.


vim +/task_stack_page +49 arch/s390/include/asm/entry-common.h

56e62a737028360 Sven Schnelle  2020-11-21  41  
56e62a737028360 Sven Schnelle  2020-11-21  42  static __always_inline void arch_exit_to_user_mode(void)
56e62a737028360 Sven Schnelle  2020-11-21  43  {
8c09871a950a3fe Heiko Carstens 2024-02-03  44  	load_user_fpu_regs();
56e62a737028360 Sven Schnelle  2020-11-21  45  
56e62a737028360 Sven Schnelle  2020-11-21  46  	if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
56e62a737028360 Sven Schnelle  2020-11-21  47  		debug_user_asce(1);
39d62336f5c126a Thomas Richter 2022-05-04  48  
39d62336f5c126a Thomas Richter 2022-05-04 @49  	pai_kernel_exit(current_pt_regs());
56e62a737028360 Sven Schnelle  2020-11-21  50  }
56e62a737028360 Sven Schnelle  2020-11-21  51  

:::::: The code at line 49 was first introduced by commit
:::::: 39d62336f5c126ad6dccdf66cd249f2d0e86d3c9 s390/pai: add support for cryptography counters

:::::: TO: Thomas Richter <[email protected]>
:::::: CC: Heiko Carstens <[email protected]>

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