Re: [PATCH v4 2/3] mm, page_owner: Add page_owner_stacks file to print out only stacks and their counte

[kernel test robot <lkp@intel.com>]

Hi Oscar,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.3-rc7]
[cannot apply to akpm-mm/mm-everything next-20230420]
[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/Oscar-Salvador/lib-stackdepot-Add-a-refcount-field-in-stack_record/20230421-181709
patch link:    https://lore.kernel.org/r/20230421101415.5734-3-osalvador%40suse.de
patch subject: [PATCH v4 2/3] mm, page_owner: Add page_owner_stacks file to print out only stacks and their counte
config: ia64-allyesconfig (https://download.01.org/0day-ci/archive/20230421/202304212153.jLLmROz6-lkp@intel.com/config)
compiler: ia64-linux-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/6c6dfc43015e1939f433f4371d33418ab4d03411
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Oscar-Salvador/lib-stackdepot-Add-a-refcount-field-in-stack_record/20230421-181709
        git checkout 6c6dfc43015e1939f433f4371d33418ab4d03411
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=ia64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=ia64 SHELL=/bin/bash M=lib/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304212153.jLLmROz6-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/page_ext.h:7,
                    from include/linux/mm.h:22,
                    from include/linux/mman.h:5,
                    from lib/test_user_copy.c:13:
>> include/linux/stackdepot.h:120:26: warning: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration
     120 | void *stack_start(struct seq_file *m, loff_t *ppos);
         |                          ^~~~~~~~
   include/linux/stackdepot.h:121:25: warning: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration
     121 | void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
         |                         ^~~~~~~~
   include/linux/stackdepot.h:122:24: warning: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration
     122 | int stack_print(struct seq_file *m, void *v);
         |                        ^~~~~~~~


vim +120 include/linux/stackdepot.h

    99	
   100	/**
   101	 * stack_depot_save - Save a stack trace to stack depot
   102	 *
   103	 * @entries:		Pointer to the stack trace
   104	 * @nr_entries:		Number of frames in the stack
   105	 * @alloc_flags:	Allocation GFP flags
   106	 *
   107	 * Context: Contexts where allocations via alloc_pages() are allowed.
   108	 *          See __stack_depot_save() for more details.
   109	 *
   110	 * Return: Handle of the stack trace stored in depot, 0 on failure
   111	 */
   112	depot_stack_handle_t stack_depot_save(unsigned long *entries,
   113					      unsigned int nr_entries, gfp_t gfp_flags);
   114	depot_stack_handle_t stack_depot_save_action(unsigned long *entries,
   115						     unsigned int nr_entries,
   116						     gfp_t gfp_flags,
   117						     bool counter);
   118	
   119	#ifdef CONFIG_PAGE_OWNER
 > 120	void *stack_start(struct seq_file *m, loff_t *ppos);
   121	void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
   122	int stack_print(struct seq_file *m, void *v);
   123	#endif
   124	

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https://github.com/intel/lkp-tests