linux-kernel - [mingo-tip:sched/headers 13/2340] include/linux/rcupdate.h:414:36: error: dereferencing pointer to incomplete type 'struct css

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Message-ID: <202202240645.bKyoBrpQ-lkp@intel.com>
Date:   Thu, 24 Feb 2022 07:01:41 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: [mingo-tip:sched/headers 13/2340] include/linux/rcupdate.h:414:36:
 error: dereferencing pointer to incomplete type 'struct css_set'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   97c5eeb4de3ad324ed2a4656b46465299cfd010a
commit: c4ad6fcb67c42d65481c85733c8009c8afdfdf4e [13/2340] sched/headers: Reorganize, clean up and optimize kernel/sched/fair.c dependencies
config: i386-randconfig-a003 (https://download.01.org/0day-ci/archive/20220224/202202240645.bKyoBrpQ-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=c4ad6fcb67c42d65481c85733c8009c8afdfdf4e
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout c4ad6fcb67c42d65481c85733c8009c8afdfdf4e
        # save the config file to linux build tree
        mkdir build_dir
        make 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@...el.com>

Note: the mingo-tip/sched/headers HEAD 97c5eeb4de3ad324ed2a4656b46465299cfd010a builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

   In file included from ./arch/x86/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:255,
                    from include/linux/export.h:43,
                    from include/linux/linkage.h:7,
                    from include/linux/kernel.h:17,
                    from include/linux/cpumask.h:10,
                    from include/linux/energy_model.h:4,
                    from kernel/sched/fair.c:23:
   include/linux/psi.h: In function 'cgroup_move_task':
>> include/linux/rcupdate.h:414:36: error: dereferencing pointer to incomplete type 'struct css_set'
     414 | #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
         |                                    ^~~~
   include/asm-generic/rwonce.h:55:33: note: in definition of macro '__WRITE_ONCE'
      55 |  *(volatile typeof(x) *)&(x) = (val);    \
         |                                 ^~~
   arch/x86/include/asm/barrier.h:67:2: note: in expansion of macro 'WRITE_ONCE'
      67 |  WRITE_ONCE(*p, v);      \
         |  ^~~~~~~~~~
   include/asm-generic/barrier.h:164:55: note: in expansion of macro '__smp_store_release'
     164 | #define smp_store_release(p, v) do { kcsan_release(); __smp_store_release(p, v); } while (0)
         |                                                       ^~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:455:3: note: in expansion of macro 'smp_store_release'
     455 |   smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
         |   ^~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:455:25: note: in expansion of macro 'RCU_INITIALIZER'
     455 |   smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
         |                         ^~~~~~~~~~~~~~~
   include/linux/psi.h:58:2: note: in expansion of macro 'rcu_assign_pointer'
      58 |  rcu_assign_pointer(p->cgroups, to);
         |  ^~~~~~~~~~~~~~~~~~
   In file included from kernel/sched/fair.c:52:
   kernel/sched/sched.h: In function 'sched_core_account_forceidle':
   kernel/sched/sched.h:1934:6: error: implicit declaration of function 'schedstat_enabled'; did you mean 'sched_core_enabled'? [-Werror=implicit-function-declaration]
    1934 |  if (schedstat_enabled())
         |      ^~~~~~~~~~~~~~~~~
         |      sched_core_enabled
   kernel/sched/fair.c: At top level:
   kernel/sched/fair.c:11136:6: warning: no previous prototype for 'task_vruntime_update' [-Wmissing-prototypes]
   11136 | void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi)
         |      ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +414 include/linux/rcupdate.h

ca5ecddfa8fcbd Paul E. McKenney 2010-04-28  409  
462225ae47d717 Paul E. McKenney 2013-11-11  410  /**
462225ae47d717 Paul E. McKenney 2013-11-11  411   * RCU_INITIALIZER() - statically initialize an RCU-protected global variable
462225ae47d717 Paul E. McKenney 2013-11-11  412   * @v: The value to statically initialize with.
462225ae47d717 Paul E. McKenney 2013-11-11  413   */
462225ae47d717 Paul E. McKenney 2013-11-11 @414  #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
462225ae47d717 Paul E. McKenney 2013-11-11  415  

:::::: The code at line 414 was first introduced by commit
:::::: 462225ae47d7175f886281d8a91708550cd5178c rcu: Add an RCU_INITIALIZER for global RCU-protected pointers

:::::: TO: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
:::::: CC: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

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