Re: [PATCH v8 1/4] userfaultfd: Add UFFD WP Async support

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

Hi Muhammad,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on shuah-kselftest/next]
[also build test WARNING on shuah-kselftest/fixes linus/master v6.2-rc5 next-20230124]
[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/Muhammad-Usama-Anjum/userfaultfd-Add-UFFD-WP-Async-support/20230124-164601
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
patch link:    https://lore.kernel.org/r/20230124084323.1363825-2-usama.anjum%40collabora.com
patch subject: [PATCH v8 1/4] userfaultfd: Add UFFD WP Async support
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20230124/202301241800.pdnow11d-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/59e98aec663b7ca8fd5f3b3d2a0f17f777f425c4
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Muhammad-Usama-Anjum/userfaultfd-Add-UFFD-WP-Async-support/20230124-164601
        git checkout 59e98aec663b7ca8fd5f3b3d2a0f17f777f425c4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/mm_inline.h:9,
                    from kernel/fork.c:46:
>> include/linux/userfaultfd_k.h:278:5: warning: no previous prototype for 'userfaultfd_wp_async' [-Wmissing-prototypes]
     278 | int userfaultfd_wp_async(struct vm_area_struct *vma)
         |     ^~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:162:13: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes]
     162 | void __weak arch_release_task_struct(struct task_struct *tsk)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:862:20: warning: no previous prototype for 'arch_task_cache_init' [-Wmissing-prototypes]
     862 | void __init __weak arch_task_cache_init(void) { }
         |                    ^~~~~~~~~~~~~~~~~~~~
   kernel/fork.c:957:12: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes]
     957 | int __weak arch_dup_task_struct(struct task_struct *dst,
         |            ^~~~~~~~~~~~~~~~~~~~
--
   In file included from include/linux/hugetlb.h:14,
                    from kernel/sysctl.c:46:
>> include/linux/userfaultfd_k.h:278:5: warning: no previous prototype for 'userfaultfd_wp_async' [-Wmissing-prototypes]
     278 | int userfaultfd_wp_async(struct vm_area_struct *vma)
         |     ^~~~~~~~~~~~~~~~~~~~
--
   In file included from include/linux/mm_inline.h:9,
                    from mm/memory.c:44:
>> include/linux/userfaultfd_k.h:278:5: warning: no previous prototype for 'userfaultfd_wp_async' [-Wmissing-prototypes]
     278 | int userfaultfd_wp_async(struct vm_area_struct *vma)
         |     ^~~~~~~~~~~~~~~~~~~~
   mm/memory.c: In function 'wp_huge_pmd':
   mm/memory.c:4824:33: error: implicit declaration of function 'set_pmd_at'; did you mean 'set_pte_at'? [-Werror=implicit-function-declaration]
    4824 |                                 set_pmd_at(vmf->vma->vm_mm, vmf->address, vmf->pmd,
         |                                 ^~~~~~~~~~
         |                                 set_pte_at
   cc1: some warnings being treated as errors
--
   In file included from include/linux/hugetlb.h:14,
                    from fs/proc/meminfo.c:6:
>> include/linux/userfaultfd_k.h:278:5: warning: no previous prototype for 'userfaultfd_wp_async' [-Wmissing-prototypes]
     278 | int userfaultfd_wp_async(struct vm_area_struct *vma)
         |     ^~~~~~~~~~~~~~~~~~~~
   fs/proc/meminfo.c:22:28: warning: no previous prototype for 'arch_report_meminfo' [-Wmissing-prototypes]
      22 | void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
         |                            ^~~~~~~~~~~~~~~~~~~


vim +/userfaultfd_wp_async +278 include/linux/userfaultfd_k.h

   277	
 > 278	int userfaultfd_wp_async(struct vm_area_struct *vma)
   279	{
   280		return false;
   281	}
   282	

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