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@xxxxxxxxx/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@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202310031433.kyisgGOt-lkp@xxxxxxxxx/ 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@xxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
