Re: [RFC PATCH 3/5] mm/madvise: add PMADV_NO_ERROR_ON_UNMAPPED process_madvise() flag

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

Hi Lorenzo,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on next-20250516]
[cannot apply to linus/master v6.15-rc7]
[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/Lorenzo-Stoakes/mm-madvise-refactor-madvise_populate/20250520-045528
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/0e7d82b8e8f4ac58d51c18fc059ea2ca235df47c.1747686021.git.lorenzo.stoakes%40oracle.com
patch subject: [RFC PATCH 3/5] mm/madvise: add PMADV_NO_ERROR_ON_UNMAPPED process_madvise() flag
config: parisc-randconfig-002-20250520 (https://download.01.org/0day-ci/archive/20250521/202505210322.vb8tP6T7-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250521/202505210322.vb8tP6T7-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/202505210322.vb8tP6T7-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/madvise.c: In function 'madvise_populate':
   mm/madvise.c:969:48: error: 'PMADV_SKIP_ERRORS' undeclared (first use in this function)
     969 |         bool can_skip = madv_behavior->flags & PMADV_SKIP_ERRORS;
         |                                                ^~~~~~~~~~~~~~~~~
   mm/madvise.c:969:48: note: each undeclared identifier is reported only once for each function it appears in
   mm/madvise.c: In function 'madvise_vma_behavior':
   mm/madvise.c:1374:48: error: 'PMADV_SKIP_ERRORS' undeclared (first use in this function)
    1374 |         bool can_skip = madv_behavior->flags & PMADV_SKIP_ERRORS;
         |                                                ^~~~~~~~~~~~~~~~~
   mm/madvise.c: In function 'madvise_inject_error':
   mm/madvise.c:1393:48: error: 'PMADV_SKIP_ERRORS' undeclared (first use in this function)
    1393 |         bool can_skip = madv_behavior->flags & PMADV_SKIP_ERRORS;
         |                                                ^~~~~~~~~~~~~~~~~
   mm/madvise.c: In function 'madvise_do_behavior':
>> mm/madvise.c:1755:57: error: 'PMADV_NO_ERROR_ON_UNMAPPED' undeclared (first use in this function)
    1755 |         bool err_on_unmapped = !(madv_behavior->flags & PMADV_NO_ERROR_ON_UNMAPPED);
         |                                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/madvise.c: In function 'vector_madvise':
   mm/madvise.c:1884:33: error: 'PMADV_SKIP_ERRORS' undeclared (first use in this function)
    1884 |         bool can_skip = flags & PMADV_SKIP_ERRORS;
         |                                 ^~~~~~~~~~~~~~~~~
   mm/madvise.c: In function 'check_process_madvise_flags':
   mm/madvise.c:1954:29: error: 'PMADV_SKIP_ERRORS' undeclared (first use in this function)
    1954 |         unsigned int mask = PMADV_SKIP_ERRORS | PMADV_NO_ERROR_ON_UNMAPPED;
         |                             ^~~~~~~~~~~~~~~~~
   mm/madvise.c:1954:49: error: 'PMADV_NO_ERROR_ON_UNMAPPED' undeclared (first use in this function)
    1954 |         unsigned int mask = PMADV_SKIP_ERRORS | PMADV_NO_ERROR_ON_UNMAPPED;
         |                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/PMADV_NO_ERROR_ON_UNMAPPED +1755 mm/madvise.c

  1746	
  1747	static int madvise_do_behavior(struct mm_struct *mm,
  1748			unsigned long start, size_t len_in,
  1749			struct madvise_behavior *madv_behavior)
  1750	{
  1751		int behavior = madv_behavior->behavior;
  1752		struct blk_plug plug;
  1753		unsigned long end;
  1754		int error;
> 1755		bool err_on_unmapped = !(madv_behavior->flags & PMADV_NO_ERROR_ON_UNMAPPED);
  1756	
  1757		if (is_memory_failure(behavior))
  1758			return madvise_inject_error(madv_behavior, start,
  1759						    start + len_in);
  1760		start = untagged_addr_remote(mm, start);
  1761		end = start + PAGE_ALIGN(len_in);
  1762	
  1763		blk_start_plug(&plug);
  1764		if (is_madvise_populate(behavior))
  1765			error = madvise_populate(mm, start, end, madv_behavior);
  1766		else
  1767			error = madvise_walk_vmas(mm, start, end, err_on_unmapped,
  1768						  madv_behavior, madvise_vma_behavior);
  1769		blk_finish_plug(&plug);
  1770		return error;
  1771	}
  1772	

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