Hi Olga, kernel test robot noticed the following build errors: [auto build test ERROR on trondmy-nfs/linux-next] [also build test ERROR on brauner-vfs/vfs.all linus/master v6.13-rc7 next-20250116] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Olga-Kornievskaia/llist-add-ability-to-remove-a-particular-entry-from-the-list/20250116-072951 base: git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next patch link: https://lore.kernel.org/r/20250115232406.44815-2-okorniev%40redhat.com patch subject: [PATCH 1/3] llist: add ability to remove a particular entry from the list config: s390-randconfig-002-20250117 (https://download.01.org/0day-ci/archive/20250117/202501171157.gr1JO94W-lkp@xxxxxxxxx/config) compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project c23f2417dc5f6dc371afb07af5627ec2a9d373a0) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250117/202501171157.gr1JO94W-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/202501171157.gr1JO94W-lkp@xxxxxxxxx/ All error/warnings (new ones prefixed by >>): In file included from arch/s390/kernel/asm-offsets.c:11: In file included from include/linux/kvm_host.h:7: In file included from include/linux/hardirq.h:5: In file included from include/linux/context_tracking_state.h:5: In file included from include/linux/percpu.h:5: In file included from include/linux/alloc_tag.h:14: In file included from include/linux/smp.h:15: In file included from include/linux/smp_types.h:5: >> include/linux/llist.h:283:7: warning: variable 'pos' is uninitialized when used here [-Wuninitialized] 283 | if (pos->next == entry) { | ^~~ include/linux/llist.h:269:24: note: initialize the variable 'pos' to silence this warning 269 | struct llist_node *pos; | ^ | = NULL In file included from arch/s390/kernel/asm-offsets.c:11: In file included from include/linux/kvm_host.h:16: In file included from include/linux/mm.h:2224: include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 505 | item]; | ~~~~ include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 512 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 525 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ 4 warnings generated. -- In file included from <built-in>:4: In file included from lib/vdso/getrandom.c:8: In file included from include/vdso/datapage.h:164: In file included from arch/s390/include/asm/vdso/gettimeofday.h:11: In file included from arch/s390/include/asm/syscall.h:13: In file included from include/linux/sched.h:20: In file included from include/linux/smp_types.h:5: >> include/linux/llist.h:283:7: warning: variable 'pos' is uninitialized when used here [-Wuninitialized] 283 | if (pos->next == entry) { | ^~~ include/linux/llist.h:269:24: note: initialize the variable 'pos' to silence this warning 269 | struct llist_node *pos; | ^ | = NULL 1 warning generated. -- In file included from lib/vsprintf.c:22: In file included from include/linux/clk.h:14: In file included from include/linux/notifier.h:14: In file included from include/linux/mutex.h:17: In file included from include/linux/lockdep.h:14: In file included from include/linux/smp.h:15: In file included from include/linux/smp_types.h:5: >> include/linux/llist.h:283:7: warning: variable 'pos' is uninitialized when used here [-Wuninitialized] 283 | if (pos->next == entry) { | ^~~ include/linux/llist.h:269:24: note: initialize the variable 'pos' to silence this warning 269 | struct llist_node *pos; | ^ | = NULL In file included from lib/vsprintf.c:25: In file included from include/linux/module.h:19: In file included from include/linux/elf.h:6: In file included from arch/s390/include/asm/elf.h:181: In file included from arch/s390/include/asm/mmu_context.h:11: In file included from arch/s390/include/asm/pgalloc.h:18: In file included from include/linux/mm.h:2224: include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 505 | item]; | ~~~~ include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 512 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 525 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ In file included from lib/vsprintf.c:50: In file included from lib/../mm/internal.h:13: include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 47 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages); | ~~~~~~~~~~~ ^ ~~~ include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 49 | NR_ZONE_LRU_BASE + lru, nr_pages); | ~~~~~~~~~~~~~~~~ ^ ~~~ 6 warnings generated. -- In file included from lib/test_bitops.c:10: In file included from include/linux/module.h:17: In file included from include/linux/kmod.h:9: In file included from include/linux/umh.h:4: In file included from include/linux/gfp.h:7: In file included from include/linux/mmzone.h:8: In file included from include/linux/spinlock.h:63: In file included from include/linux/lockdep.h:14: In file included from include/linux/smp.h:15: In file included from include/linux/smp_types.h:5: >> include/linux/llist.h:283:7: error: variable 'pos' is uninitialized when used here [-Werror,-Wuninitialized] 283 | if (pos->next == entry) { | ^~~ include/linux/llist.h:269:24: note: initialize the variable 'pos' to silence this warning 269 | struct llist_node *pos; | ^ | = NULL In file included from lib/test_bitops.c:10: In file included from include/linux/module.h:19: In file included from include/linux/elf.h:6: In file included from arch/s390/include/asm/elf.h:181: In file included from arch/s390/include/asm/mmu_context.h:11: In file included from arch/s390/include/asm/pgalloc.h:18: In file included from include/linux/mm.h:2224: include/linux/vmstat.h:504:43: error: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Werror,-Wenum-enum-conversion] 504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 505 | item]; | ~~~~ include/linux/vmstat.h:511:43: error: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Werror,-Wenum-enum-conversion] 511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 512 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:524:43: error: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Werror,-Wenum-enum-conversion] 524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 525 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ 4 errors generated. -- In file included from lib/test_maple_tree.c:10: In file included from include/linux/maple_tree.h:12: In file included from include/linux/rcupdate.h:29: In file included from include/linux/lockdep.h:14: In file included from include/linux/smp.h:15: In file included from include/linux/smp_types.h:5: >> include/linux/llist.h:283:7: warning: variable 'pos' is uninitialized when used here [-Wuninitialized] 283 | if (pos->next == entry) { | ^~~ include/linux/llist.h:269:24: note: initialize the variable 'pos' to silence this warning 269 | struct llist_node *pos; | ^ | = NULL In file included from lib/test_maple_tree.c:11: In file included from include/linux/module.h:19: In file included from include/linux/elf.h:6: In file included from arch/s390/include/asm/elf.h:181: In file included from arch/s390/include/asm/mmu_context.h:11: In file included from arch/s390/include/asm/pgalloc.h:18: In file included from include/linux/mm.h:2224: include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 505 | item]; | ~~~~ include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 512 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 525 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ lib/test_maple_tree.c:212:26: warning: unused function 'not_empty' [-Wunused-function] 212 | static inline __init int not_empty(struct maple_node *node) | ^~~~~~~~~ 5 warnings generated. -- In file included from lib/locking-selftest.c:14: In file included from include/linux/rwsem.h:15: In file included from include/linux/spinlock.h:63: In file included from include/linux/lockdep.h:14: In file included from include/linux/smp.h:15: In file included from include/linux/smp_types.h:5: >> include/linux/llist.h:283:7: warning: variable 'pos' is uninitialized when used here [-Wuninitialized] 283 | if (pos->next == entry) { | ^~~ include/linux/llist.h:269:24: note: initialize the variable 'pos' to silence this warning 269 | struct llist_node *pos; | ^ | = NULL In file included from lib/locking-selftest.c:22: In file included from include/linux/kallsyms.h:13: In file included from include/linux/mm.h:2224: include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 505 | item]; | ~~~~ include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 512 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 525 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ lib/locking-selftest.c:2510:1: warning: unused function 'class_HARDIRQ_lock_ptr' [-Wunused-function] 2510 | DEFINE_LOCK_GUARD_0(HARDIRQ, HARDIRQ_ENTER(), HARDIRQ_EXIT()) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:407:49: note: expanded from macro 'DEFINE_LOCK_GUARD_0' 407 | __DEFINE_CLASS_IS_CONDITIONAL(_name, false); \ | ^ 408 | __DEFINE_UNLOCK_GUARD(_name, void, _unlock, __VA_ARGS__) \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:378:21: note: expanded from macro '\ __DEFINE_UNLOCK_GUARD' 378 | static inline void *class_##_name##_lock_ptr(class_##_name##_t *_T) \ | ^~~~~~~~~~~~~~~~~~~~~~~~ <scratch space>:93:1: note: expanded from here 93 | class_HARDIRQ_lock_ptr | ^~~~~~~~~~~~~~~~~~~~~~ lib/locking-selftest.c:2511:1: warning: unused function 'class_NOTTHREADED_HARDIRQ_lock_ptr' [-Wunused-function] 2511 | DEFINE_LOCK_GUARD_0(NOTTHREADED_HARDIRQ, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2512 | do { | ~~~~ 2513 | local_irq_disable(); | ~~~~~~~~~~~~~~~~~~~~ 2514 | __irq_enter(); | ~~~~~~~~~~~~~~ 2515 | WARN_ON(!in_irq()); | ~~~~~~~~~~~~~~~~~~~ 2516 | } while(0), HARDIRQ_EXIT()) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:407:49: note: expanded from macro 'DEFINE_LOCK_GUARD_0' 407 | __DEFINE_CLASS_IS_CONDITIONAL(_name, false); \ | ^ 408 | __DEFINE_UNLOCK_GUARD(_name, void, _unlock, __VA_ARGS__) \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:378:21: note: expanded from macro '\ __DEFINE_UNLOCK_GUARD' 378 | static inline void *class_##_name##_lock_ptr(class_##_name##_t *_T) \ | ^~~~~~~~~~~~~~~~~~~~~~~~ <scratch space>:121:1: note: expanded from here 121 | class_NOTTHREADED_HARDIRQ_lock_ptr | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ lib/locking-selftest.c:2517:1: warning: unused function 'class_SOFTIRQ_lock_ptr' [-Wunused-function] 2517 | DEFINE_LOCK_GUARD_0(SOFTIRQ, SOFTIRQ_ENTER(), SOFTIRQ_EXIT()) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:407:49: note: expanded from macro 'DEFINE_LOCK_GUARD_0' 407 | __DEFINE_CLASS_IS_CONDITIONAL(_name, false); \ | ^ 408 | __DEFINE_UNLOCK_GUARD(_name, void, _unlock, __VA_ARGS__) \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:378:21: note: expanded from macro '\ __DEFINE_UNLOCK_GUARD' 378 | static inline void *class_##_name##_lock_ptr(class_##_name##_t *_T) \ | ^~~~~~~~~~~~~~~~~~~~~~~~ <scratch space>:141:1: note: expanded from here 141 | class_SOFTIRQ_lock_ptr | ^~~~~~~~~~~~~~~~~~~~~~ lib/locking-selftest.c:2520:1: warning: unused function 'class_RCU_lock_ptr' [-Wunused-function] 2520 | DEFINE_LOCK_GUARD_0(RCU, rcu_read_lock(), rcu_read_unlock()) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:407:49: note: expanded from macro 'DEFINE_LOCK_GUARD_0' 407 | __DEFINE_CLASS_IS_CONDITIONAL(_name, false); \ | ^ 408 | __DEFINE_UNLOCK_GUARD(_name, void, _unlock, __VA_ARGS__) \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:378:21: note: expanded from macro '\ __DEFINE_UNLOCK_GUARD' 378 | static inline void *class_##_name##_lock_ptr(class_##_name##_t *_T) \ | ^~~~~~~~~~~~~~~~~~~~~~~~ <scratch space>:159:1: note: expanded from here 159 | class_RCU_lock_ptr | ^~~~~~~~~~~~~~~~~~ lib/locking-selftest.c:2521:1: warning: unused function 'class_RCU_BH_lock_ptr' [-Wunused-function] 2521 | DEFINE_LOCK_GUARD_0(RCU_BH, rcu_read_lock_bh(), rcu_read_unlock_bh()) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cleanup.h:407:49: note: expanded from macro 'DEFINE_LOCK_GUARD_0' 407 | __DEFINE_CLASS_IS_CONDITIONAL(_name, false); \ | ^ -- In file included from kernel/bpf/kmem_cache_iter.c:3: In file included from include/linux/bpf.h:10: In file included from include/linux/workqueue.h:9: In file included from include/linux/timer.h:8: In file included from include/linux/debugobjects.h:6: In file included from include/linux/spinlock.h:63: In file included from include/linux/lockdep.h:14: In file included from include/linux/smp.h:15: In file included from include/linux/smp_types.h:5: >> include/linux/llist.h:283:7: warning: variable 'pos' is uninitialized when used here [-Wuninitialized] 283 | if (pos->next == entry) { | ^~~ include/linux/llist.h:269:24: note: initialize the variable 'pos' to silence this warning 269 | struct llist_node *pos; | ^ | = NULL In file included from kernel/bpf/kmem_cache_iter.c:3: In file included from include/linux/bpf.h:20: In file included from include/linux/module.h:19: In file included from include/linux/elf.h:6: In file included from arch/s390/include/asm/elf.h:181: In file included from arch/s390/include/asm/mmu_context.h:11: In file included from arch/s390/include/asm/pgalloc.h:18: In file included from include/linux/mm.h:2224: include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 505 | item]; | ~~~~ include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 512 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 525 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ kernel/bpf/kmem_cache_iter.c:227:27: warning: bitwise operation between different enumeration types ('enum bpf_reg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion] 227 | PTR_TO_BTF_ID_OR_NULL | PTR_TRUSTED }, | ~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~ 5 warnings generated. .. vim +/pos +283 include/linux/llist.h 255 256 /** 257 * llist_del_entry - remove a particular entry from a lock-less list 258 * @head: head of the list to remove the entry from 259 * @entry: entry to be removed from the list 260 * 261 * Walk the list, find the given entry and remove it from the list. 262 * The caller must ensure that nothing can race in and change the 263 * list while this is running. 264 * 265 * Returns true if the entry was found and removed. 266 */ 267 static inline bool llist_del_entry(struct llist_head *head, struct llist_node *entry) 268 { 269 struct llist_node *pos; 270 271 if (!head->first) 272 return false; 273 274 /* Is it the first entry? */ 275 if (head->first == entry) { 276 head->first = entry->next; 277 entry->next = entry; 278 return true; 279 } 280 281 /* Find it in the list */ 282 llist_for_each(head->first, pos) { > 283 if (pos->next == entry) { 284 pos->next = entry->next; 285 entry->next = entry; 286 return true; 287 } 288 } 289 return false; 290 } 291 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
