Hi Michał,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything] [also build test WARNING on linus/master v6.5-rc2 next-20230720] [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/Micha-Miros-aw/Re-fs-proc-tas... base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/a0b5c6776b2ed91f78a7575649f8b100e58bd3a9.168988107... patch subject: Re: fs/proc/task_mmu: Implement IOCTL for efficient page table scanning config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20230721/202307210528.2qgK1vwi-lkp@i...) compiler: mips-linux-gcc (GCC) 12.3.0 reproduce: (https://download.01.org/0day-ci/archive/20230721/202307210528.2qgK1vwi-lkp@i...)

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@intel.com | Closes: https://lore.kernel.org/oe-kbuild-all/202307210528.2qgK1vwi-lkp@intel.com/

All warnings (new ones prefixed by >>):

fs/proc/task_mmu.c: In function 'pagemap_scan_test_walk': fs/proc/task_mmu.c:1921:13: error: implicit declaration of function 'userfaultfd_wp_async'; did you mean 'userfaultfd_wp'? [-Werror=implicit-function-declaration] 1921 | if (userfaultfd_wp_async(vma) && userfaultfd_wp_use_markers(vma)) | ^~~~~~~~~~~~~~~~~~~~ | userfaultfd_wp fs/proc/task_mmu.c: In function 'pagemap_scan_init_bounce_buffer':

...

fs/proc/task_mmu.c:2290:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

2290 | p->vec_out = (void __user *)p->arg.vec; | ^ fs/proc/task_mmu.c: At top level: fs/proc/task_mmu.c:1967:13: warning: 'pagemap_scan_backout_range' defined but not used [-Wunused-function] 1967 | static void pagemap_scan_backout_range(struct pagemap_scan_private *p, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors

vim +2290 fs/proc/task_mmu.c

2264 2265 static int pagemap_scan_init_bounce_buffer(struct pagemap_scan_private *p) 2266 { 2267 if (!p->arg.vec_len) { 2268 /* 2269 * An arbitrary non-page-aligned sentinel value for 2270 * pagemap_scan_push_range(). 2271 */ 2272 p->cur_buf.start = p->cur_buf.end = ULLONG_MAX; 2273 return 0; 2274 } 2275 2276 /* 2277 * Allocate a smaller buffer to get output from inside the page 2278 * walk functions and walk the range in PAGEMAP_WALK_SIZE chunks. 2279 * The last range is always stored in p.cur_buf to allow coalescing 2280 * consecutive ranges that have the same categories returned across 2281 * walk_page_range() calls. 2282 */ 2283 p->vec_buf_len = min_t(size_t, PAGEMAP_WALK_SIZE >> PAGE_SHIFT, 2284 p->arg.vec_len - 1); 2285 p->vec_buf = kmalloc_array(p->vec_buf_len, sizeof(*p->vec_buf), 2286 GFP_KERNEL); 2287 if (!p->vec_buf) 2288 return -ENOMEM; 2289

2290 p->vec_out = (void __user *)p->arg.vec;

2291 2292 return 0; 2293 } 2294