[mmotm:master 51/95] drivers/md/bcache/btree.c:810:2: warning: ignoring return value of 'register_shrinker', declared with attribute warn_unused_result

[mmotm:master 51/95] drivers/md/bcache/btree.c:810:2: warning: ignoring return value of 'register_shrinker', declared with attribute warn_unused_result

[kbuild test robot]

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   f5ef1cb6700e8b570adae945b1e0bd4ab95d8a26
commit: a58c5788f373a7a45532d5b02ae3b0173d4273e7 [51/95] mm,vmscan: mark register_shrinker() as __must_check
config: i386-randconfig-i0-201747 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout a58c5788f373a7a45532d5b02ae3b0173d4273e7
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/md/bcache/btree.c: In function 'bch_btree_cache_alloc':
>> drivers/md/bcache/btree.c:810:2: warning: ignoring return value of 'register_shrinker', declared with attribute warn_unused_result [-Wunused-result]
     register_shrinker(&c->shrink);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/register_shrinker +810 drivers/md/bcache/btree.c

cafe5635 Kent Overstreet 2013-03-23  805  
7dc19d5a Dave Chinner    2013-08-28  806  	c->shrink.count_objects = bch_mca_count;
7dc19d5a Dave Chinner    2013-08-28  807  	c->shrink.scan_objects = bch_mca_scan;
cafe5635 Kent Overstreet 2013-03-23  808  	c->shrink.seeks = 4;
cafe5635 Kent Overstreet 2013-03-23  809  	c->shrink.batch = c->btree_pages * 2;
cafe5635 Kent Overstreet 2013-03-23 @810  	register_shrinker(&c->shrink);
cafe5635 Kent Overstreet 2013-03-23  811  
cafe5635 Kent Overstreet 2013-03-23  812  	return 0;
cafe5635 Kent Overstreet 2013-03-23  813  }
cafe5635 Kent Overstreet 2013-03-23  814  

:::::: The code at line 810 was first introduced by commit
:::::: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 bcache: A block layer cache

:::::: TO: Kent Overstreet <koverstreet@google.com>
:::::: CC: Kent Overstreet <koverstreet@google.com>

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

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