[vbabka:slab-remove-slab-v1r0 7/14] mm/kasan/quarantine.c:145:23: warning: unused variable 'flags'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git slab-remove-slab-v1r0
head:   227c2d309e94ff014379c57ecadff7df03a1e349
commit: 175f421def9a7765457d1434f9df37303ff1ed9f [7/14] KASAN: remove code paths guarded by CONFIG_SLAB
config: x86_64-randconfig-006-20231003 (https://download.01.org/0day-ci/archive/20231003/202310031433.kyisgGOt-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231003/202310031433.kyisgGOt-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310031433.kyisgGOt-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/kasan/quarantine.c: In function 'qlink_free':
>> mm/kasan/quarantine.c:145:23: warning: unused variable 'flags' [-Wunused-variable]
     145 |         unsigned long flags;
         |                       ^~~~~


vim +/flags +145 mm/kasan/quarantine.c

55834c59098d0c5 Alexander Potapenko 2016-05-20  140  
55834c59098d0c5 Alexander Potapenko 2016-05-20  141  static void qlink_free(struct qlist_node *qlink, struct kmem_cache *cache)
55834c59098d0c5 Alexander Potapenko 2016-05-20  142  {
55834c59098d0c5 Alexander Potapenko 2016-05-20  143  	void *object = qlink_to_object(qlink, cache);
26dca996ea7b1ac Andrey Konovalov    2022-01-14  144  	struct kasan_free_meta *meta = kasan_get_free_meta(cache, object);
55834c59098d0c5 Alexander Potapenko 2016-05-20 @145  	unsigned long flags;
55834c59098d0c5 Alexander Potapenko 2016-05-20  146  
26dca996ea7b1ac Andrey Konovalov    2022-01-14  147  	/*
26dca996ea7b1ac Andrey Konovalov    2022-01-14  148  	 * If init_on_free is enabled and KASAN's free metadata is stored in
26dca996ea7b1ac Andrey Konovalov    2022-01-14  149  	 * the object, zero the metadata. Otherwise, the object's memory will
26dca996ea7b1ac Andrey Konovalov    2022-01-14  150  	 * not be properly zeroed, as KASAN saves the metadata after the slab
26dca996ea7b1ac Andrey Konovalov    2022-01-14  151  	 * allocator zeroes the object.
26dca996ea7b1ac Andrey Konovalov    2022-01-14  152  	 */
26dca996ea7b1ac Andrey Konovalov    2022-01-14  153  	if (slab_want_init_on_free(cache) &&
26dca996ea7b1ac Andrey Konovalov    2022-01-14  154  	    cache->kasan_info.free_meta_offset == 0)
26dca996ea7b1ac Andrey Konovalov    2022-01-14  155  		memzero_explicit(meta, sizeof(*meta));
26dca996ea7b1ac Andrey Konovalov    2022-01-14  156  
97593cad003c668 Andrey Konovalov    2020-12-22  157  	/*
f0953a1bbaca71e Ingo Molnar         2021-05-06  158  	 * As the object now gets freed from the quarantine, assume that its
97593cad003c668 Andrey Konovalov    2020-12-22  159  	 * free track is no longer valid.
97593cad003c668 Andrey Konovalov    2020-12-22  160  	 */
06bc4cf6cdde690 Andrey Konovalov    2022-05-12  161  	*(u8 *)kasan_mem_to_shadow(object) = KASAN_SLAB_FREE;
97593cad003c668 Andrey Konovalov    2020-12-22  162  
55834c59098d0c5 Alexander Potapenko 2016-05-20  163  	___cache_free(cache, object, _THIS_IP_);
55834c59098d0c5 Alexander Potapenko 2016-05-20  164  }
55834c59098d0c5 Alexander Potapenko 2016-05-20  165  

:::::: The code at line 145 was first introduced by commit
:::::: 55834c59098d0c5a97b0f3247e55832b67facdcf mm: kasan: initial memory quarantine implementation

:::::: TO: Alexander Potapenko <glider@google.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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