Re: [RFC 1/3] mm: introduce snapshot_page()

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

Hi Luiz,

[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Luiz-Capitulino/mm-introduce-snapshot_page/20250617-222946
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/48d49e3371c35a2da6f4c42d5d9f14b6476ff734.1750170418.git.luizcap%40redhat.com
patch subject: [RFC 1/3] mm: introduce snapshot_page()
config: sh-randconfig-002-20250618 (https://download.01.org/0day-ci/archive/20250618/202506181657.pEAayfYp-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250618/202506181657.pEAayfYp-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/202506181657.pEAayfYp-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/util.c: In function 'set_flags':
>> mm/util.c:1182:13: error: implicit declaration of function 'folio_test_idle'; did you mean 'folio_test_slab'? [-Wimplicit-function-declaration]
    1182 |         if (folio_test_idle(folio))
         |             ^~~~~~~~~~~~~~~
         |             folio_test_slab


vim +1182 mm/util.c

  1174	
  1175	static void set_flags(struct page_snapshot *ps, const struct folio *folio,
  1176			      const struct page *page)
  1177	{
  1178		if (is_huge_zero_folio(folio))
  1179			ps->flags |= PAGE_SNAPSHOT_PG_HUGE_ZERO;
  1180		if (folio_ref_count(folio) == 0 && is_free_buddy_page(page))
  1181			ps->flags |= PAGE_SNAPSHOT_PG_FREE;
> 1182		if (folio_test_idle(folio))
  1183			ps->flags |= PAGE_SNAPSHOT_PG_IDLE;
  1184	}
  1185	

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