Re: [PATCH v2 1/3] mm: memory-failure: update ttu flag inside unmap_poisoned_folio

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

Hi Wupeng,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Wupeng-Ma/mm-memory-failure-update-ttu-flag-inside-unmap_poisoned_folio/20250116-142614
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250116061657.227027-2-mawupeng1%40huawei.com
patch subject: [PATCH v2 1/3] mm: memory-failure: update ttu flag inside unmap_poisoned_folio
config: x86_64-buildonly-randconfig-002-20250117 (https://download.01.org/0day-ci/archive/20250117/202501171215.KLa8VDaS-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250117/202501171215.KLa8VDaS-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/202501171215.KLa8VDaS-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/memory_hotplug.c:41:
   mm/internal.h:1142:1: error: expected identifier or '(' before '{' token
    1142 | {
         | ^
>> mm/internal.h:1141:19: warning: 'unmap_poisoned_folio' used but never defined
    1141 | static inline int unmap_poisoned_folio(struct folio *folio, unsigned long pfn, bool must_kill);
         |                   ^~~~~~~~~~~~~~~~~~~~


vim +/unmap_poisoned_folio +1141 mm/internal.h

  1121	
  1122	extern u32 hwpoison_filter_dev_major;
  1123	extern u32 hwpoison_filter_dev_minor;
  1124	extern u64 hwpoison_filter_flags_mask;
  1125	extern u64 hwpoison_filter_flags_value;
  1126	extern u64 hwpoison_filter_memcg;
  1127	extern u32 hwpoison_filter_enable;
  1128	#define MAGIC_HWPOISON	0x48575053U	/* HWPS */
  1129	void SetPageHWPoisonTakenOff(struct page *page);
  1130	void ClearPageHWPoisonTakenOff(struct page *page);
  1131	bool take_page_off_buddy(struct page *page);
  1132	bool put_page_back_buddy(struct page *page);
  1133	struct task_struct *task_early_kill(struct task_struct *tsk, int force_early);
  1134	void add_to_kill_ksm(struct task_struct *tsk, const struct page *p,
  1135			     struct vm_area_struct *vma, struct list_head *to_kill,
  1136			     unsigned long ksm_addr);
  1137	unsigned long page_mapped_in_vma(const struct page *page,
  1138			struct vm_area_struct *vma);
  1139	
  1140	#else
> 1141	static inline int unmap_poisoned_folio(struct folio *folio, unsigned long pfn, bool must_kill);
  1142	{
  1143		return -EBUSY;
  1144	}
  1145	#endif
  1146	

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