:::::: :::::: Manual check reason: "low confidence static check warning: kernel/rcu/tasks.h:1256:15: sparse: sparse: cast to non-scalar" ::::::
CC: [email protected] BCC: [email protected] CC: "GNU/Weeb Mailing List" <[email protected]> CC: [email protected] TO: "Paul E. McKenney" <[email protected]> tree: https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev head: 771634294326a0a64ecf1e9a9a824031cb3fb324 commit: 96102856a205a4cae8b18b468209127478176860 [72/85] rcu-tasks: Untrack blocked RCU Tasks Trace at reader end :::::: branch date: 13 hours ago :::::: commit date: 21 hours ago config: alpha-randconfig-s031-20220608 (https://download.01.org/0day-ci/archive/20220608/[email protected]/config) compiler: alpha-linux-gcc (GCC) 11.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-26-gb3cf30ba-dirty # https://github.com/ammarfaizi2/linux-block/commit/96102856a205a4cae8b18b468209127478176860 git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev git checkout 96102856a205a4cae8b18b468209127478176860 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=alpha SHELL=/bin/bash kernel/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <[email protected]> sparse warnings: (new ones prefixed by >>) kernel/rcu/update.c: note: in included file: >> kernel/rcu/tasks.h:1256:15: sparse: sparse: cast to non-scalar >> kernel/rcu/tasks.h:1256:15: sparse: sparse: cast from non-scalar vim +1256 kernel/rcu/tasks.h 3f1afa3a24f543 Paul E. McKenney 2022-05-23 1246 d5f177d35c2442 Paul E. McKenney 2020-03-09 1247 /* If we are the last reader, wake up the grace-period kthread. */ a5c071ccfa1728 Paul E. McKenney 2021-07-28 1248 void rcu_read_unlock_trace_special(struct task_struct *t) d5f177d35c2442 Paul E. McKenney 2020-03-09 1249 { 96102856a205a4 Paul E. McKenney 2022-05-17 1250 unsigned long flags; 96102856a205a4 Paul E. McKenney 2022-05-17 1251 struct rcu_tasks_percpu *rtpcp; 96102856a205a4 Paul E. McKenney 2022-05-17 1252 union rcu_special trs; 96102856a205a4 Paul E. McKenney 2022-05-17 1253 96102856a205a4 Paul E. McKenney 2022-05-17 1254 // Open-coded full-word version of rcu_ld_need_qs(). 96102856a205a4 Paul E. McKenney 2022-05-17 1255 smp_mb(); // Enforce full grace-period ordering. 96102856a205a4 Paul E. McKenney 2022-05-17 @1256 trs = smp_load_acquire(&t->trc_reader_special); 276c410448dbca Paul E. McKenney 2020-03-17 1257 3f1afa3a24f543 Paul E. McKenney 2022-05-23 1258 if (IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB) && t->trc_reader_special.b.need_mb) 276c410448dbca Paul E. McKenney 2020-03-17 1259 smp_mb(); // Pairs with update-side barriers. 276c410448dbca Paul E. McKenney 2020-03-17 1260 // Update .need_qs before ->trc_reader_nesting for irq/NMI handlers. 96102856a205a4 Paul E. McKenney 2022-05-17 1261 if (trs.b.need_qs == (TRC_NEED_QS_CHECKED | TRC_NEED_QS)) { 3f1afa3a24f543 Paul E. McKenney 2022-05-23 1262 u8 result = rcu_trc_cmpxchg_need_qs(t, TRC_NEED_QS_CHECKED | TRC_NEED_QS, 3f1afa3a24f543 Paul E. McKenney 2022-05-23 1263 TRC_NEED_QS_CHECKED); 3f1afa3a24f543 Paul E. McKenney 2022-05-23 1264 96102856a205a4 Paul E. McKenney 2022-05-17 1265 WARN_ONCE(result != trs.b.need_qs, "%s: result = %d", __func__, result); 96102856a205a4 Paul E. McKenney 2022-05-17 1266 } 96102856a205a4 Paul E. McKenney 2022-05-17 1267 if (trs.b.blocked) { 96102856a205a4 Paul E. McKenney 2022-05-17 1268 rtpcp = per_cpu_ptr(rcu_tasks_trace.rtpcpu, t->trc_blkd_cpu); 96102856a205a4 Paul E. McKenney 2022-05-17 1269 raw_spin_lock_irqsave_rcu_node(rtpcp, flags); 96102856a205a4 Paul E. McKenney 2022-05-17 1270 list_del_init(&t->trc_blkd_node); 96102856a205a4 Paul E. McKenney 2022-05-17 1271 WRITE_ONCE(t->trc_reader_special.b.blocked, false); 96102856a205a4 Paul E. McKenney 2022-05-17 1272 raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags); 3f1afa3a24f543 Paul E. McKenney 2022-05-23 1273 } a5c071ccfa1728 Paul E. McKenney 2021-07-28 1274 WRITE_ONCE(t->trc_reader_nesting, 0); d5f177d35c2442 Paul E. McKenney 2020-03-09 1275 } d5f177d35c2442 Paul E. McKenney 2020-03-09 1276 EXPORT_SYMBOL_GPL(rcu_read_unlock_trace_special); d5f177d35c2442 Paul E. McKenney 2020-03-09 1277 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
