tree:   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   14a6f1989dae9445d4532941bdd6bbad84f4c8da
commit: 3b242c66ccbd60cf47ab0e8992119d9617548c23 x86: mm: enable deferred struct page initialisation on x86-64
date:   3 days ago
config: x86_64-randconfig-x006-201527 (attached as .config)
reproduce:
  git checkout 3b242c66ccbd60cf47ab0e8992119d9617548c23
  # save the attached .config to linux build tree
  make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   mm/page_alloc.c: In function 'early_page_uninitialised':
>> mm/page_alloc.c:247:6: warning: unused variable 'nid' [-Wunused-variable]
     int nid = early_pfn_to_nid(pfn);
         ^

vim +/nid +247 mm/page_alloc.c

62bc62a8 Christoph Lameter 2009-06-16  231  int nr_online_nodes __read_mostly = 1;
418508c1 Miklos Szeredi    2007-05-23  232  EXPORT_SYMBOL(nr_node_ids);
62bc62a8 Christoph Lameter 2009-06-16  233  EXPORT_SYMBOL(nr_online_nodes);
418508c1 Miklos Szeredi    2007-05-23  234  #endif
418508c1 Miklos Szeredi    2007-05-23  235  
9ef9acb0 Mel Gorman        2007-10-16  236  int page_group_by_mobility_disabled __read_mostly;
9ef9acb0 Mel Gorman        2007-10-16  237  
3a80a7fa Mel Gorman        2015-06-30  238  #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
3a80a7fa Mel Gorman        2015-06-30  239  static inline void reset_deferred_meminit(pg_data_t *pgdat)
3a80a7fa Mel Gorman        2015-06-30  240  {
3a80a7fa Mel Gorman        2015-06-30  241  	pgdat->first_deferred_pfn = ULONG_MAX;
3a80a7fa Mel Gorman        2015-06-30  242  }
3a80a7fa Mel Gorman        2015-06-30  243  
3a80a7fa Mel Gorman        2015-06-30  244  /* Returns true if the struct page for the pfn is uninitialised */
3a80a7fa Mel Gorman        2015-06-30  245  static inline bool __defermem_init early_page_uninitialised(unsigned long pfn)
3a80a7fa Mel Gorman        2015-06-30  246  {
3a80a7fa Mel Gorman        2015-06-30 @247  	int nid = early_pfn_to_nid(pfn);
3a80a7fa Mel Gorman        2015-06-30  248  
3a80a7fa Mel Gorman        2015-06-30  249  	if (pfn >= NODE_DATA(nid)->first_deferred_pfn)
3a80a7fa Mel Gorman        2015-06-30  250  		return true;
3a80a7fa Mel Gorman        2015-06-30  251  
3a80a7fa Mel Gorman        2015-06-30  252  	return false;
3a80a7fa Mel Gorman        2015-06-30  253  }
3a80a7fa Mel Gorman        2015-06-30  254  
7e18adb4 Mel Gorman        2015-06-30  255  static inline bool early_page_nid_uninitialised(unsigned long pfn, int nid)

:::::: The code at line 247 was first introduced by commit
:::::: 3a80a7fa7989fbb6aa56bb6ad31811b62cf99e60 mm: meminit: initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set

:::::: TO: Mel Gorman <mgorman@suse.de>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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