[memcg:attempts/oom-detection-rework-4.5 363/363] mm/page_alloc.c:3034:4: warning: value computed is not used

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git attempts/oom-detection-rework-4.5
head:   8f3c89f13f00171577cf29806390e687426f5a78
commit: 8f3c89f13f00171577cf29806390e687426f5a78 [363/363] mm: use MIGRATE_SYNC in page allocation path
config: openrisc-or1ksim_defconfig (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 8f3c89f13f00171577cf29806390e687426f5a78
        # save the attached .config to linux build tree
        make.cross ARCH=openrisc 

All warnings (new ones prefixed by >>):

   mm/page_alloc.c: In function 'should_compact_retry':
>> mm/page_alloc.c:3034:4: warning: value computed is not used

vim +3034 mm/page_alloc.c

  3018	should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
  3019			     enum compact_result compact_result, enum migrate_mode *migrate_mode,
  3020			     int compaction_retries)
  3021	{
  3022		int max_retries = MAX_COMPACT_RETRIES;
  3023	
  3024		if (!order)
  3025			return false;
  3026	
  3027		/*
  3028		 * compaction considers all the zone as desperately out of memory
  3029		 * so it doesn't really make much sense to retry except when the
  3030		 * failure could be caused by weak migration mode.
  3031		 */
  3032		if (compaction_failed(compact_result)) {
  3033			if (*migrate_mode < MIGRATE_SYNC) {
> 3034				*migrate_mode++;
  3035				return true;
  3036			}
  3037			return false;
  3038		}
  3039	
  3040		/*
  3041		 * make sure the compaction wasn't deferred or didn't bail out early
  3042		 * due to locks contention before we declare that we should give up.

---
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