tree:   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b79013b2449c23f1f505bdf39c5a6c330338b244
commit: f8224aa5a0a4627926019bba7511926393fbee3b mm, compaction: do not recheck suitable_migration_target under lock
date:   6 months ago
config: x86_64-randconfig-ib0-04141359 (attached as .config)
reproduce:
  git checkout f8224aa5a0a4627926019bba7511926393fbee3b
  # save the attached .config to linux build tree
  make ARCH=x86_64 

All warnings:

>> mm/compaction.c:250:13: warning: 'suitable_migration_target' defined but not used [-Wunused-function]
    static bool suitable_migration_target(struct page *page)
                ^

vim +/suitable_migration_target +250 mm/compaction.c

be976572 Vlastimil Babka 2014-06-04  234  static inline bool compact_should_abort(struct compact_control *cc)
be976572 Vlastimil Babka 2014-06-04  235  {
be976572 Vlastimil Babka 2014-06-04  236  	/* async compaction aborts if contended */
be976572 Vlastimil Babka 2014-06-04  237  	if (need_resched()) {
be976572 Vlastimil Babka 2014-06-04  238  		if (cc->mode == MIGRATE_ASYNC) {
be976572 Vlastimil Babka 2014-06-04  239  			cc->contended = true;
be976572 Vlastimil Babka 2014-06-04  240  			return true;
be976572 Vlastimil Babka 2014-06-04  241  		}
be976572 Vlastimil Babka 2014-06-04  242  
be976572 Vlastimil Babka 2014-06-04  243  		cond_resched();
be976572 Vlastimil Babka 2014-06-04  244  	}
be976572 Vlastimil Babka 2014-06-04  245  
be976572 Vlastimil Babka 2014-06-04  246  	return false;
be976572 Vlastimil Babka 2014-06-04  247  }
be976572 Vlastimil Babka 2014-06-04  248  
f40d1e42 Mel Gorman      2012-10-08  249  /* Returns true if the page is within a block suitable for migration to */
f40d1e42 Mel Gorman      2012-10-08 @250  static bool suitable_migration_target(struct page *page)
f40d1e42 Mel Gorman      2012-10-08  251  {
7d348b9e Joonsoo Kim     2014-04-07  252  	/* If the page is a large free page, then disallow migration */
f40d1e42 Mel Gorman      2012-10-08  253  	if (PageBuddy(page) && page_order(page) >= pageblock_order)
7d348b9e Joonsoo Kim     2014-04-07  254  		return false;
f40d1e42 Mel Gorman      2012-10-08  255  
f40d1e42 Mel Gorman      2012-10-08  256  	/* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
7d348b9e Joonsoo Kim     2014-04-07  257  	if (migrate_async_suitable(get_pageblock_migratetype(page)))
f40d1e42 Mel Gorman      2012-10-08  258  		return true;

:::::: The code at line 250 was first introduced by commit
:::::: f40d1e42bb988d2a26e8e111ea4c4c7bac819b7e mm: compaction: acquire the zone->lock as late as possible

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

---
0-DAY kernel test infrastructure                Open Source Technology Center
http://lists.01.org/mailman/listinfo/kbuild                 Intel Corporation