tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d15be546031cf65a0fc34879beca02fd90fe7ac7 commit: 5d6742b37727e111f4755155e59c5319cf5caa7b rcu/nocb: Use rcu_segcblist for no-CBs CPUs date: 12 months ago config: sparc64-randconfig-s031-20200723 (attached as .config) compiler: sparc64-linux-gcc (GCC) 9.3.0 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: v0.6.2-93-g4c6cbe55-dirty git checkout 5d6742b37727e111f4755155e59c5319cf5caa7b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=sparc64
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> sparse warnings: (new ones prefixed by >>) kernel/rcu/tree.c:1124:13: sparse: sparse: context imbalance in 'rcu_start_this_gp' - different lock contexts for basic block kernel/rcu/tree.c:1520:9: sparse: sparse: context imbalance in 'rcu_gp_init' - different lock contexts for basic block kernel/rcu/tree.c:2226:9: sparse: sparse: context imbalance in 'force_qs_rnp' - different lock contexts for basic block kernel/rcu/tree.c: note: in included file (through arch/sparc/include/asm/qspinlock.h, arch/sparc/include/asm/spinlock_64.h, arch/sparc/include/asm/spinlock.h, ...): include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'rcu_force_quiescent_state' - unexpected unlock kernel/rcu/tree.c: note: in included file: kernel/rcu/tree_exp.h:193:9: sparse: sparse: context imbalance in '__rcu_report_exp_rnp' - different lock contexts for basic block kernel/rcu/tree.c: note: in included file: kernel/rcu/tree_plugin.h:1503:9: sparse: sparse: context imbalance in 'rcu_nocb_lock' - wrong count at exit kernel/rcu/tree.c: note: in included file (through arch/sparc/include/asm/qspinlock.h, arch/sparc/include/asm/spinlock_64.h, arch/sparc/include/asm/spinlock.h, ...): >> include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in >> 'rcu_nocb_unlock' - unexpected unlock kernel/rcu/tree.c: note: in included file: kernel/rcu/tree_plugin.h:1530:17: sparse: sparse: context imbalance in 'rcu_nocb_unlock_irqrestore' - unexpected unlock kernel/rcu/tree_plugin.h:1611:13: sparse: sparse: context imbalance in '__call_rcu_nocb_wake' - wrong count at exit vim +/rcu_nocb_unlock +94 include/asm-generic/qspinlock.h a33fda35e3a7655 Waiman Long 2015-04-24 83 a33fda35e3a7655 Waiman Long 2015-04-24 84 #ifndef queued_spin_unlock a33fda35e3a7655 Waiman Long 2015-04-24 85 /** a33fda35e3a7655 Waiman Long 2015-04-24 86 * queued_spin_unlock - release a queued spinlock a33fda35e3a7655 Waiman Long 2015-04-24 87 * @lock : Pointer to queued spinlock structure a33fda35e3a7655 Waiman Long 2015-04-24 88 */ a33fda35e3a7655 Waiman Long 2015-04-24 89 static __always_inline void queued_spin_unlock(struct qspinlock *lock) a33fda35e3a7655 Waiman Long 2015-04-24 90 { a33fda35e3a7655 Waiman Long 2015-04-24 91 /* ca50e426f96c905 Pan Xinhui 2016-06-03 92 * unlock() needs release semantics: a33fda35e3a7655 Waiman Long 2015-04-24 93 */ 626e5fbc1435890 Will Deacon 2018-04-26 @94 smp_store_release(&lock->locked, 0); a33fda35e3a7655 Waiman Long 2015-04-24 95 } a33fda35e3a7655 Waiman Long 2015-04-24 96 #endif a33fda35e3a7655 Waiman Long 2015-04-24 97 :::::: The code at line 94 was first introduced by commit :::::: 626e5fbc14358901ddaa90ce510e0fbeab310432 locking/qspinlock: Use smp_store_release() in queued_spin_unlock() :::::: TO: Will Deacon <[email protected]> :::::: CC: Ingo Molnar <[email protected]> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
.config.gz
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