Re: [PATCH] memcg: localize memcg_kmem_enabled() check

[kbuild test robot <lkp@xxxxxxxxx>]

Hi Shakeel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20 next-20190102]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Shakeel-Butt/memcg-localize-memcg_kmem_enabled-check/20190103-120255
config: x86_64-randconfig-x013-201900 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   mm/page_alloc.c: In function 'free_pages_prepare':
>> mm/page_alloc.c:1059:3: error: implicit declaration of function '__memcg_kmem_uncharge'; did you mean 'memcg_kmem_uncharge'? [-Werror=implicit-function-declaration]
      __memcg_kmem_uncharge(page, order);
      ^~~~~~~~~~~~~~~~~~~~~
      memcg_kmem_uncharge
   In file included from include/asm-generic/bug.h:5:0,
                    from arch/x86/include/asm/bug.h:83,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:9,
                    from mm/page_alloc.c:18:
   mm/page_alloc.c: In function '__alloc_pages_nodemask':
>> mm/page_alloc.c:4553:15: error: implicit declaration of function '__memcg_kmem_charge'; did you mean 'memcg_kmem_charge'? [-Werror=implicit-function-declaration]
         unlikely(__memcg_kmem_charge(page, gfp_mask, order) != 0)) {
                  ^
   include/linux/compiler.h:77:42: note: in definition of macro 'unlikely'
    # define unlikely(x) __builtin_expect(!!(x), 0)
                                             ^
   cc1: some warnings being treated as errors

vim +1059 mm/page_alloc.c

  1024	
  1025	static __always_inline bool free_pages_prepare(struct page *page,
  1026						unsigned int order, bool check_free)
  1027	{
  1028		int bad = 0;
  1029	
  1030		VM_BUG_ON_PAGE(PageTail(page), page);
  1031	
  1032		trace_mm_page_free(page, order);
  1033	
  1034		/*
  1035		 * Check tail pages before head page information is cleared to
  1036		 * avoid checking PageCompound for order-0 pages.
  1037		 */
  1038		if (unlikely(order)) {
  1039			bool compound = PageCompound(page);
  1040			int i;
  1041	
  1042			VM_BUG_ON_PAGE(compound && compound_order(page) != order, page);
  1043	
  1044			if (compound)
  1045				ClearPageDoubleMap(page);
  1046			for (i = 1; i < (1 << order); i++) {
  1047				if (compound)
  1048					bad += free_tail_pages_check(page, page + i);
  1049				if (unlikely(free_pages_check(page + i))) {
  1050					bad++;
  1051					continue;
  1052				}
  1053				(page + i)->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
  1054			}
  1055		}
  1056		if (PageMappingFlags(page))
  1057			page->mapping = NULL;
  1058		if (memcg_kmem_enabled() && PageKmemcg(page))
> 1059			__memcg_kmem_uncharge(page, order);
  1060		if (check_free)
  1061			bad += free_pages_check(page);
  1062		if (bad)
  1063			return false;
  1064	
  1065		page_cpupid_reset_last(page);
  1066		page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
  1067		reset_page_owner(page, order);
  1068	
  1069		if (!PageHighMem(page)) {
  1070			debug_check_no_locks_freed(page_address(page),
  1071						   PAGE_SIZE << order);
  1072			debug_check_no_obj_freed(page_address(page),
  1073						   PAGE_SIZE << order);
  1074		}
  1075		arch_free_page(page, order);
  1076		kernel_poison_pages(page, 1 << order, 0);
  1077		kernel_map_pages(page, 1 << order, 0);
  1078		kasan_free_nondeferred_pages(page, order);
  1079	
  1080		return true;
  1081	}
  1082	

---
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