Re: [PATCH v2] kasan/quarantine: fix bugs on qlist_move_cache()

[kbuild test robot <lkp@intel.com>]

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Hi,

[auto build test WARNING on v4.7-rc5]
[also build test WARNING on next-20160701]
[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/js1304-gmail-com/kasan-quarantine-fix-bugs-on-qlist_move_cache/20160702-102811
config: x86_64-randconfig-r0-07021543 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   mm/kasan/quarantine.c: In function 'qlist_move_cache':
>> mm/kasan/quarantine.c:242:35: warning: unused variable 'tail' [-Wunused-variable]
     struct qlist_node *head = NULL, *tail = NULL;
                                      ^~~~
>> mm/kasan/quarantine.c:242:21: warning: unused variable 'head' [-Wunused-variable]
     struct qlist_node *head = NULL, *tail = NULL;
                        ^~~~

vim +/tail +242 mm/kasan/quarantine.c

   226			    global_quarantine.bytes - QUARANTINE_LOW_SIZE)
   227				break;
   228			last = last->next;
   229		}
   230		qlist_move(&global_quarantine, last, &to_free, size_to_free);
   231	
   232		spin_unlock_irqrestore(&quarantine_lock, flags);
   233	
   234		qlist_free_all(&to_free, NULL);
   235	}
   236	
   237	static void qlist_move_cache(struct qlist_head *from,
   238					   struct qlist_head *to,
   239					   struct kmem_cache *cache)
   240	{
   241		struct qlist_node *curr;
 > 242		struct qlist_node *head = NULL, *tail = NULL;
   243	
   244		if (unlikely(qlist_empty(from)))
   245			return;
   246	
   247		curr = from->head;
   248		qlist_init(from);
   249		while (curr) {
   250			struct qlist_node *qlink = curr;

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

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