tree:   git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   e6455bc5b91f41f842f30465c9193320f0568707
commit: cbba4e22584984bffccd07e0801fd2b8ec1ecf5f [6277/6751] Move /proc/kpageidle to /sys/kernel/mm/page_idle/bitmap
config: sh-allmodconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout cbba4e22584984bffccd07e0801fd2b8ec1ecf5f
  # save the attached .config to linux build tree
  make.cross ARCH=sh 

All error/warnings (new ones prefixed by >>):

   mm/page_idle.c: In function 'page_idle_clear_pte_refs_one':
>> mm/page_idle.c:67:4: error: implicit declaration of function 'pmdp_test_and_clear_young' [-Werror=implicit-function-declaration]
>> mm/page_idle.c:71:3: error: implicit declaration of function 'page_check_address' [-Werror=implicit-function-declaration]
>> mm/page_idle.c:71:7: warning: assignment makes pointer from integer without a cast [enabled by default]
>> mm/page_idle.c:73:4: error: implicit declaration of function 'ptep_test_and_clear_young' [-Werror=implicit-function-declaration]
   mm/page_idle.c: In function 'page_idle_clear_pte_refs':
>> mm/page_idle.c:95:22: error: variable 'rwc' has initializer but incomplete type
>> mm/page_idle.c:96:3: error: unknown field 'rmap_one' specified in initializer
>> mm/page_idle.c:96:3: warning: excess elements in struct initializer [enabled by default]
>> mm/page_idle.c:96:3: warning: (near initialization for 'rwc') [enabled by default]
>> mm/page_idle.c:97:3: error: unknown field 'anon_lock' specified in initializer
>> mm/page_idle.c:97:16: error: 'page_lock_anon_vma_read' undeclared (first use in this function)
   mm/page_idle.c:97:16: note: each undeclared identifier is reported only once for each function it appears in
   mm/page_idle.c:97:3: warning: excess elements in struct initializer [enabled by default]
   mm/page_idle.c:97:3: warning: (near initialization for 'rwc') [enabled by default]
>> mm/page_idle.c:95:40: error: storage size of 'rwc' isn't known
>> mm/page_idle.c:109:2: error: implicit declaration of function 'rmap_walk' [-Werror=implicit-function-declaration]
>> mm/page_idle.c:95:40: warning: unused variable 'rwc' [-Wunused-variable]
   cc1: some warnings being treated as errors

vim +/pmdp_test_and_clear_young +67 mm/page_idle.c

    61		bool referenced = false;
    62	
    63		if (unlikely(PageTransHuge(page))) {
    64			pmd = page_check_address_pmd(page, mm, addr,
    65						     PAGE_CHECK_ADDRESS_PMD_FLAG, &ptl);
    66			if (pmd) {
  > 67				referenced = pmdp_clear_young_notify(vma, addr, pmd);
    68				spin_unlock(ptl);
    69			}
    70		} else {
  > 71			pte = page_check_address(page, mm, addr, &ptl, 0);
    72			if (pte) {
  > 73				referenced = ptep_clear_young_notify(vma, addr, pte);
    74				pte_unmap_unlock(pte, ptl);
    75			}
    76		}
    77		if (referenced) {
    78			clear_page_idle(page);
    79			/*
    80			 * We cleared the referenced bit in a mapping to this page. To
    81			 * avoid interference with page reclaim, mark it young so that
    82			 * page_referenced() will return > 0.
    83			 */
    84			set_page_young(page);
    85		}
    86		return SWAP_AGAIN;
    87	}
    88	
    89	static void page_idle_clear_pte_refs(struct page *page)
    90	{
    91		/*
    92		 * Since rwc.arg is unused, rwc is effectively immutable, so we
    93		 * can make it static const to save some cycles and stack.
    94		 */
  > 95		static const struct rmap_walk_control rwc = {
  > 96			.rmap_one = page_idle_clear_pte_refs_one,
  > 97			.anon_lock = page_lock_anon_vma_read,
    98		};
    99		bool need_lock;
   100	
   101		if (!page_mapped(page) ||
   102		    !page_rmapping(page))
   103			return;
   104	
   105		need_lock = !PageAnon(page) || PageKsm(page);
   106		if (need_lock && !trylock_page(page))
   107			return;
   108	
 > 109		rmap_walk(page, (struct rmap_walk_control *)&rwc);
   110	
   111		if (need_lock)
   112			unlock_page(page);

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation