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Subject[rcu:dev.2020.04.03a 101/101] kernel/rcu/tasks.h:251:9: error: 'struct task_struct' has no member named 'rcu_tasks_idx'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.04.03a
head: 8c64539e2d8fbd96ad4bb60a96c5d9c1ef823572
commit: 8c64539e2d8fbd96ad4bb60a96c5d9c1ef823572 [101/101] squash! ftrace: Use synchronize_rcu_tasks_rude() instead of ftrace_sync()
config: powerpc-defconfig (attached as .config)
compiler: powerpc64-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
git checkout 8c64539e2d8fbd96ad4bb60a96c5d9c1ef823572
# save the attached .config to linux build tree
GCC_VERSION=9.3.0 make.cross ARCH=powerpc

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

In file included from kernel/rcu/update.c:563:
kernel/rcu/tasks.h: In function 'exit_tasks_rcu_start':
>> kernel/rcu/tasks.h:251:9: error: 'struct task_struct' has no member named 'rcu_tasks_idx'
251 | current->rcu_tasks_idx = __srcu_read_lock(&tasks_rcu_exit_srcu);
| ^~
kernel/rcu/tasks.h: In function 'exit_tasks_rcu_finish':
kernel/rcu/tasks.h:263:44: error: 'struct task_struct' has no member named 'rcu_tasks_idx'
263 | __srcu_read_unlock(&tasks_rcu_exit_srcu, t->rcu_tasks_idx);
| ^~

vim +251 kernel/rcu/tasks.h

dfdddf06801dcb Paul E. McKenney 2020-03-03 246
dfdddf06801dcb Paul E. McKenney 2020-03-03 247 /* Do the srcu_read_lock() for the above synchronize_srcu(). */
dfdddf06801dcb Paul E. McKenney 2020-03-03 248 void exit_tasks_rcu_start(void) __acquires(&tasks_rcu_exit_srcu)
dfdddf06801dcb Paul E. McKenney 2020-03-03 249 {
dfdddf06801dcb Paul E. McKenney 2020-03-03 250 preempt_disable();
dfdddf06801dcb Paul E. McKenney 2020-03-03 @251 current->rcu_tasks_idx = __srcu_read_lock(&tasks_rcu_exit_srcu);
dfdddf06801dcb Paul E. McKenney 2020-03-03 252 preempt_enable();
4dbad397293c85 Paul E. McKenney 2020-03-02 253 }
dfdddf06801dcb Paul E. McKenney 2020-03-03 254

:::::: The code at line 251 was first introduced by commit
:::::: dfdddf06801dcbee9f3ab515aad75421b3e3e75f rcu-tasks: Refactor RCU-tasks to allow variants to be added

:::::: TO: Paul E. McKenney <paulmck@kernel.org>
:::::: CC: Paul E. McKenney <paulmck@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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