[kees:for-next/kspp 21/25] drivers/misc/lkdtm/stackleak.c:17:39: error: call to undeclared function 'stackleak_task_low_bound'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/kspp
head:   d46ac904fd35edfccc5080818e950d4d3b4697c4
commit: f4cfacd92972cc440d534b5156df23d0a2136bab [21/25] lkdtm/stackleak: rework boundary management
config: s390-randconfig-r044-20220502 (https://download.01.org/0day-ci/archive/20220505/202205050943.HDgeO9iV-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 363b3a645a1e30011cc8da624f13dac5fd915628)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id=f4cfacd92972cc440d534b5156df23d0a2136bab
        git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
        git fetch --no-tags kees for-next/kspp
        git checkout f4cfacd92972cc440d534b5156df23d0a2136bab
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> drivers/misc/lkdtm/stackleak.c:17:39: error: call to undeclared function 'stackleak_task_low_bound'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           const unsigned long task_stack_low = stackleak_task_low_bound(current);
                                                ^
>> drivers/misc/lkdtm/stackleak.c:18:40: error: call to undeclared function 'stackleak_task_high_bound'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           const unsigned long task_stack_high = stackleak_task_high_bound(current);
                                                 ^
   drivers/misc/lkdtm/stackleak.c:19:22: warning: incompatible pointer to integer conversion initializing 'const unsigned long' with an expression of type 'unsigned long (void)' [-Wint-conversion]
           const unsigned long current_sp = current_stack_pointer;
                               ^            ~~~~~~~~~~~~~~~~~~~~~
   drivers/misc/lkdtm/stackleak.c:20:43: error: no member named 'lowest_stack' in 'struct task_struct'; did you mean 'ret_stack'?
           const unsigned long lowest_sp = current->lowest_stack;
                                                    ^~~~~~~~~~~~
                                                    ret_stack
   include/linux/sched.h:1365:28: note: 'ret_stack' declared here
           struct ftrace_ret_stack         *ret_stack;
                                            ^
   drivers/misc/lkdtm/stackleak.c:20:22: warning: incompatible pointer to integer conversion initializing 'const unsigned long' with an expression of type 'struct ftrace_ret_stack *' [-Wint-conversion]
           const unsigned long lowest_sp = current->lowest_stack;
                               ^           ~~~~~~~~~~~~~~~~~~~~~
   drivers/misc/lkdtm/stackleak.c:42:16: error: call to undeclared function 'stackleak_find_top_of_poison'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           poison_high = stackleak_find_top_of_poison(task_stack_low, untracked_high);
                         ^
   2 warnings and 4 errors generated.


vim +/stackleak_task_low_bound +17 drivers/misc/lkdtm/stackleak.c

    13	
    14	void lkdtm_STACKLEAK_ERASING(void)
    15	{
    16		const unsigned long task_stack_base = (unsigned long)task_stack_page(current);
  > 17		const unsigned long task_stack_low = stackleak_task_low_bound(current);
  > 18		const unsigned long task_stack_high = stackleak_task_high_bound(current);

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