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SubjectRe: Re: fs/proc/task_mmu: Implement IOCTL for efficient page table scanning
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-rc7 next-20230825]
[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-task_mmu-Implement-IOCTL-for-efficient-page-table-scanning/20230721-033050
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/a0b5c6776b2ed91f78a7575649f8b100e58bd3a9.1689881078.git.mirq-linux%40rere.qmqm.pl
patch subject: Re: fs/proc/task_mmu: Implement IOCTL for efficient page table scanning
config: i386-randconfig-i004-20230720 (https://download.01.org/0day-ci/archive/20230826/202308262125.VHTuZ7uV-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230826/202308262125.VHTuZ7uV-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308262125.VHTuZ7uV-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 +/pagemap_scan_backout_range +1967 fs/proc/task_mmu.c

1966
> 1967 static void pagemap_scan_backout_range(struct pagemap_scan_private *p,
1968 unsigned long addr, unsigned long end)
1969 {
1970 struct page_region *cur_buf = &p->cur_buf;
1971
1972 if (cur_buf->start != addr) {
1973 cur_buf->end = addr;
1974 } else {
1975 cur_buf->start = cur_buf->end = 0;
1976 }
1977
1978 p->end_addr = 0;
1979 }
1980

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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