Re: [PATCH] arm64: Add user stacktrace support

[kernel test robot]

Hi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on linus/master v6.7-rc1 next-20231117]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/qiwuchen55-gmail-com/arm64-Add-user-stacktrace-support/20231118-214756
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link:    https://lore.kernel.org/r/20231118134504.154842-1-qiwu.chen%40transsion.com
patch subject: [PATCH] arm64: Add user stacktrace support
config: arm64-randconfig-r071-20231119 (https://download.01.org/0day-ci/archive/20231119/202311190405.QUvoF0b3-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231119/202311190405.QUvoF0b3-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311190405.QUvoF0b3-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> arch/arm64/kernel/stacktrace.c:393: warning: expecting prototype for stack_trace_save_user(). Prototype was for arch_stack_walk_user() instead


vim +393 arch/arm64/kernel/stacktrace.c

   384	
   385	/**
   386	 * stack_trace_save_user - Save user space stack traces into a storage array
   387	 * @consume_entry: Callback for save a user space stack trace
   388	 * @cookie:	Caller supplied pointer handed back by arch_stack_walk()
   389	 * @regs: The pt_regs pointer of current task
   390	 */
   391	void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
   392				  const struct pt_regs *regs)
 > 393	{
   394		struct stack_frame_user frame;
   395		struct vm_area_struct *vma;
   396		unsigned long userstack_start, userstack_end;
   397		struct task_struct *tsk = current;
   398	
   399		/* TODO: support stack unwind for compat user mode */
   400		if (!regs || !user_mode(regs) || compat_user_mode(regs))
   401			return;
   402	
   403		userstack_start = regs->user_regs.sp;
   404		vma = find_user_stack_vma(tsk, userstack_start);
   405		if (!vma)
   406			return;
   407	
   408		userstack_end = vma->vm_end;
   409		frame.fp = regs->user_regs.regs[29];
   410		frame.sp = userstack_start;
   411		frame.pc = regs->user_regs.pc;
   412	
   413		while (1) {
   414			unsigned long where = frame.pc;
   415	
   416			/* Sanity check: ABI requires pc to be aligned 4 bytes. */
   417			if (!where || where & 0x3)
   418				break;
   419			if (!consume_entry(cookie, where))
   420				break;
   421			if (arch_unwind_user_frame(tsk, userstack_end, &frame) < 0)
   422				break;
   423		}
   424	}
   425	

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