Re: [PATCH v1] hugetlb: support FOLL_FORCE|FOLL_WRITE

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

Hi Guillaume,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.13-rc1 next-20241204]
[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/Guillaume-Morin/hugetlb-support-FOLL_FORCE-FOLL_WRITE/20241205-022843
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/Z1Ce6j5WiBE3kaGf%40bender.morinfr.org
patch subject: [PATCH v1] hugetlb: support FOLL_FORCE|FOLL_WRITE
config: i386-buildonly-randconfig-002 (https://download.01.org/0day-ci/archive/20241205/202412050943.6b8BLXfY-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241205/202412050943.6b8BLXfY-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/202412050943.6b8BLXfY-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/gup.c:7:
   In file included from include/linux/mm.h:2223:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from mm/gup.c:20:
   include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      47 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
         |                                    ~~~~~~~~~~~ ^ ~~~
   include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      49 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
         |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/gup.c:665:41: error: call to undeclared function 'pud_soft_dirty'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     665 |         return !vma_soft_dirty_enabled(vma) || pud_soft_dirty(pud);
         |                                                ^
   mm/gup.c:665:41: note: did you mean 'pmd_soft_dirty'?
   include/linux/pgtable.h:1427:19: note: 'pmd_soft_dirty' declared here
    1427 | static inline int pmd_soft_dirty(pmd_t pmd)
         |                   ^
   3 warnings and 1 error generated.


vim +/pud_soft_dirty +665 mm/gup.c

   650	
   651	#ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES
   652	/* FOLL_FORCE can write to even unwritable PUDs in COW mappings. */
   653	static inline bool can_follow_write_pud(pud_t pud, struct page *page,
   654						struct vm_area_struct *vma,
   655						unsigned int flags)
   656	{
   657		/* If the pud is writable, we can write to the page. */
   658		if (pud_write(pud))
   659			return true;
   660	
   661		if (!can_follow_write_common(page, vma, flags))
   662			return false;
   663	
   664		/* ... and a write-fault isn't required for other reasons. */
 > 665		return !vma_soft_dirty_enabled(vma) || pud_soft_dirty(pud);
   666	}
   667	

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