[mark:randomize-kstack-siphash 1/1] arch/s390/include/asm/entry-common.h:57:2: error: call to undeclared function 'choose_random_kstack_offset'; ISO C99 and later do not support implicit function declarations

[mark:randomize-kstack-siphash 1/1] arch/s390/include/asm/entry-common.h:57:2: error: call to undeclared function 'choose_random_kstack_offset'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git randomize-kstack-siphash
head:   0783912db6e30339d55a5dc7eb6a696b440bedb3
commit: 0783912db6e30339d55a5dc7eb6a696b440bedb3 [1/1] HACK: use siphash to generate kstack offset per-task
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20251125/202511252158.AzXWFYsv-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9e9fe08b16ea2c4d9867fb4974edf2a3776d6ece)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251125/202511252158.AzXWFYsv-lkp@intel.com/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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511252158.AzXWFYsv-lkp@intel.com/

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:
   In file included from include/linux/irq-entry-common.h:12:
>> arch/s390/include/asm/entry-common.h:57:2: error: call to undeclared function 'choose_random_kstack_offset'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      57 |         choose_random_kstack_offset(get_tod_clock_fast());
         |         ^
   1 error generated.
--
   In file included from arch/s390/kernel/syscall.c:35:
   In file included from include/linux/entry-common.h:5:
   In file included from include/linux/irq-entry-common.h:12:
>> arch/s390/include/asm/entry-common.h:57:2: error: call to undeclared function 'choose_random_kstack_offset'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      57 |         choose_random_kstack_offset(get_tod_clock_fast());
         |         ^
>> arch/s390/kernel/syscall.c:89:2: error: call to undeclared function 'add_random_kstack_offset'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      89 |         add_random_kstack_offset();
         |         ^
   2 errors generated.


vim +/choose_random_kstack_offset +57 arch/s390/include/asm/entry-common.h

56e62a73702836 Sven Schnelle 2020-11-21  53  
bae1cd368c45d1 Sven Schnelle 2021-04-29  54  static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
bae1cd368c45d1 Sven Schnelle 2021-04-29  55  						  unsigned long ti_work)
bae1cd368c45d1 Sven Schnelle 2021-04-29  56  {
6db1208bf95b4c Kees Cook     2024-06-19 @57  	choose_random_kstack_offset(get_tod_clock_fast());
bae1cd368c45d1 Sven Schnelle 2021-04-29  58  }
bae1cd368c45d1 Sven Schnelle 2021-04-29  59  

:::::: The code at line 57 was first introduced by commit
:::::: 6db1208bf95b4c091897b597c415e11edeab2e2d randomize_kstack: Remove non-functional per-arch entropy filtering

:::::: TO: Kees Cook <kees@kernel.org>
:::::: CC: Kees Cook <kees@kernel.org>

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