[PATCH v4 1/2] panic: add option to dump task maps info in panic_print

[kernel test robot]

Hi qiwu.chen,

kernel test robot noticed the following build errors:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on brauner-vfs/vfs.all akpm-mm/mm-everything linus/master v6.11 next-20240924]
[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/qiwu-chen/arm64-show-signal-info-for-global-init/20240924-154508
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link:    https://lore.kernel.org/r/20240924074341.37272-1-qiwu.chen%40transsion.com
patch subject: [PATCH v4 1/2] panic: add option to dump task maps info in panic_print
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20240924/202409242208.SqjERCDw-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240924/202409242208.SqjERCDw-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409242208.SqjERCDw-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/panic.c:15:
   In file included from include/linux/kgdb.h:19:
   In file included from include/linux/kprobes.h:28:
   In file included from include/linux/ftrace.h:13:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:2232:
   include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     514 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> kernel/panic.c:235:3: error: call to undeclared function 'get_vma_name'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     235 |                 get_vma_name(vma, &path, &name, &name_fmt);
         |                 ^
   1 warning and 1 error generated.


vim +/get_vma_name +235 kernel/panic.c

   210	
   211	/*
   212	 * This function is called in panic proccess if the PANIC_PRINT_TASK_MAPS_INFO
   213	 * flag is specified in panic_print, which is helpful to debug panic issues due
   214	 * to an unhandled falut in user mode such as kill init.
   215	 */
   216	static void dump_task_maps_info(struct task_struct *tsk)
   217	{
   218		struct pt_regs *user_ret = task_pt_regs(tsk);
   219		struct mm_struct *mm = tsk->mm;
   220		struct vm_area_struct *vma;
   221	
   222		if (!mm || !user_mode(user_ret))
   223			return;
   224	
   225		pr_info("Dump task %s:%d maps start\n", tsk->comm, task_pid_nr(tsk));
   226		mmap_read_lock(mm);
   227		VMA_ITERATOR(vmi, mm, 0);
   228		for_each_vma(vmi, vma) {
   229			int flags = vma->vm_flags;
   230			unsigned long long pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
   231			const struct path *path;
   232			const char *name_fmt, *name;
   233			char name_buf[SZ_256];
   234	
 > 235			get_vma_name(vma, &path, &name, &name_fmt);
   236			if (path) {
   237				name = d_path(path, name_buf, sizeof(name_buf));
   238				name = IS_ERR(name) ? "?" : name;
   239			} else if (name || name_fmt) {
   240				snprintf(name_buf, sizeof(name_buf), name_fmt ?: "%s", name);
   241				name = name_buf;
   242			}
   243	
   244			if (name)
   245				pr_info("%08lx-%08lx %c%c%c%c %08llx %s\n",
   246					vma->vm_start, vma->vm_end,
   247					flags & VM_READ ? 'r' : '-',
   248					flags & VM_WRITE ? 'w' : '-',
   249					flags & VM_EXEC ? 'x' : '-',
   250					flags & VM_MAYSHARE ? 's' : 'p',
   251					pgoff, name);
   252	
   253		}
   254		mmap_read_unlock(mm);
   255		pr_info("Dump task %s:%d maps end\n", tsk->comm, task_pid_nr(tsk));
   256	}
   257	

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