[tip:WIP.core/stacktrace 28/32] kernel/livepatch/transition.c:261: undefined reference to `stack_trace_save_tsk_reliable'

[tip:WIP.core/stacktrace 28/32] kernel/livepatch/transition.c:261: undefined reference to `stack_trace_save_tsk_reliable'

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.core/stacktrace
head:   ee23ee068fe24272f77ff014181286db32179754
commit: 6f6b2fc2fbf712e39df84edc62265273259f8aa1 [28/32] livepatch: Simplify stack trace retrieval
config: x86_64-randconfig-s5-04161121 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 6f6b2fc2fbf712e39df84edc62265273259f8aa1
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   kernel/livepatch/transition.o: In function `klp_check_stack':
>> kernel/livepatch/transition.c:261: undefined reference to `stack_trace_save_tsk_reliable'

vim +261 kernel/livepatch/transition.c

   249	
   250	/*
   251	 * Determine whether it's safe to transition the task to the target patch state
   252	 * by looking for any to-be-patched or to-be-unpatched functions on its stack.
   253	 */
   254	static int klp_check_stack(struct task_struct *task, char *err_buf)
   255	{
   256		static unsigned long entries[MAX_STACK_ENTRIES];
   257		struct klp_object *obj;
   258		struct klp_func *func;
   259		int ret, nr_entries;
   260	
 > 261		ret = stack_trace_save_tsk_reliable(task, entries, ARRAY_SIZE(entries));
   262		WARN_ON_ONCE(ret == -ENOSYS);
   263		if (ret < 0) {
   264			snprintf(err_buf, STACK_ERR_BUF_SIZE,
   265				 "%s: %s:%d has an unreliable stack\n",
   266				 __func__, task->comm, task->pid);
   267			return ret;
   268		}
   269		nr_entries = ret;
   270	
   271		klp_for_each_object(klp_transition_patch, obj) {
   272			if (!obj->patched)
   273				continue;
   274			klp_for_each_func(obj, func) {
   275				ret = klp_check_stack_func(func, entries, nr_entries);
   276				if (ret) {
   277					snprintf(err_buf, STACK_ERR_BUF_SIZE,
   278						 "%s: %s:%d is sleeping on function %s\n",
   279						 __func__, task->comm, task->pid,
   280						 func->old_name);
   281					return ret;
   282				}
   283			}
   284		}
   285	
   286		return 0;
   287	}
   288	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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