Hi Peng,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on tip/master linux/master linus/master v5.16-rc1 next-20211116]
[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]

url:    https://github.com/0day-ci/linux/commits/Peng-Wang/sched-idle-support-busy-loop-polling-on-idle-SMT-cpus/20211116-195600
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 8ea9183db4ad8afbcb7089a77c23eaf965b0cacd
config: i386-randconfig-r034-20211116 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/11c6a63e5c0f496b43058351f1e2a488ee27a5ec
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Peng-Wang/sched-idle-support-busy-loop-polling-on-idle-SMT-cpus/20211116-195600
        git checkout 11c6a63e5c0f496b43058351f1e2a488ee27a5ec
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> kernel/sched/idle.c:73:44: error: use of undeclared identifier 'cpu_cgrp_id'
           tg = container_of(task_css_check(current, cpu_cgrp_id, true),
                                                     ^
>> kernel/sched/idle.c:73:44: error: use of undeclared identifier 'cpu_cgrp_id'
>> kernel/sched/idle.c:73:44: error: use of undeclared identifier 'cpu_cgrp_id'
>> kernel/sched/idle.c:73:7: error: offsetof of incomplete type 'struct task_group'
           tg = container_of(task_css_check(current, cpu_cgrp_id, true),
                ^
   include/linux/kernel.h:498:21: note: expanded from macro 'container_of'
           ((type *)(__mptr - offsetof(type, member))); })
                              ^        ~~~~
   include/linux/stddef.h:17:32: note: expanded from macro 'offsetof'
   #define offsetof(TYPE, MEMBER)  __compiler_offsetof(TYPE, MEMBER)
                                   ^                   ~~~~
   include/linux/compiler_types.h:140:35: note: expanded from macro '__compiler_offsetof'
   #define __compiler_offsetof(a, b)       __builtin_offsetof(a, b)
                                           ^                  ~
   include/linux/sched.h:69:8: note: forward declaration of 'struct task_group'
   struct task_group;
          ^
>> kernel/sched/idle.c:73:5: error: assigning to 'struct task_group *' from incompatible type 'void'
           tg = container_of(task_css_check(current, cpu_cgrp_id, true),
              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/sched/idle.c:75:29: error: incomplete definition of type 'struct task_group'
           rq->need_smt_idle_poll = tg->need_smt_idle_poll;
                                    ~~^
   include/linux/sched.h:69:8: note: forward declaration of 'struct task_group'
   struct task_group;
          ^
   6 errors generated.


vim +/cpu_cgrp_id +73 kernel/sched/idle.c

    57	
    58	void smt_idle_poll_switch(struct rq *rq)
    59	{
    60		struct rq *smt_rq;
    61		struct task_group *tg;
    62		int smt, cpu;
    63	
    64		if (!static_branch_unlikely(&__smt_idle_poll_enabled))
    65			return;
    66	
    67		if (rq->idle == current) {
    68			rq->need_smt_idle_poll = false;
    69			return;
    70		}
    71	
    72		rcu_read_lock();
  > 73		tg = container_of(task_css_check(current, cpu_cgrp_id, true),
    74			struct task_group, css);
  > 75		rq->need_smt_idle_poll = tg->need_smt_idle_poll;
    76		rcu_read_unlock();
    77	
    78		if (!rq->need_smt_idle_poll)
    79			return;
    80	
    81		cpu = rq->cpu;
    82		for_each_cpu(smt, cpu_smt_mask(cpu)) {
    83			if (cpu == smt || !cpu_online(smt))
    84				continue;
    85			smt_rq = cpu_rq(smt);
    86			if (smt_rq->idle == smt_rq->curr && !smt_rq->in_smt_idle_poll)
    87				smp_send_reschedule(smt);
    88		}
    89	}
    90	

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