Re: [PATCH v3 08/14] sched: Replace rq->curr access w/ rq_curr(rq)

[kernel test robot <lkp@intel.com>]

Hi John,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/locking/core]
[also build test ERROR on tip/master tip/auto-latest linus/master v6.3-rc6 next-20230411]
[cannot apply to tip/sched/core]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/John-Stultz/locking-ww_mutex-Remove-wakeups-from-under-mutex-wait_lock/20230411-122859
patch link:    https://lore.kernel.org/r/20230411042511.1606592-9-jstultz%40google.com
patch subject: [PATCH v3 08/14] sched: Replace rq->curr access w/ rq_curr(rq)
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20230411/202304112129.2DLHpwAl-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/b562351b6a0f874c80020dfc83b22a6f8959aaec
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review John-Stultz/locking-ww_mutex-Remove-wakeups-from-under-mutex-wait_lock/20230411-122859
        git checkout b562351b6a0f874c80020dfc83b22a6f8959aaec
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304112129.2DLHpwAl-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/s390/include/asm/rwonce.h:29,
                    from include/linux/compiler.h:247,
                    from include/linux/kernel.h:20,
                    from include/linux/cpumask.h:10,
                    from include/linux/energy_model.h:4,
                    from kernel/sched/fair.c:23:
   kernel/sched/fair.c: In function 'task_numa_compare':
>> include/asm-generic/rwonce.h:44:71: error: lvalue required as unary '&' operand
      44 | #define __READ_ONCE(x)  (*(const volatile __unqual_scalar_typeof(x) *)&(x))
         |                                                                       ^
   include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
      50 |         __READ_ONCE(x);                                                 \
         |         ^~~~~~~~~~~
   include/linux/rcupdate.h:462:50: note: in expansion of macro 'READ_ONCE'
     462 |         typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
         |                                                  ^~~~~~~~~
   include/linux/rcupdate.h:610:9: note: in expansion of macro '__rcu_dereference_check'
     610 |         __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
         |         ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:682:28: note: in expansion of macro 'rcu_dereference_check'
     682 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
         |                            ^~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:1961:15: note: in expansion of macro 'rcu_dereference'
    1961 |         cur = rcu_dereference(rq_curr(dst_rq));
         |               ^~~~~~~~~~~~~~~
   kernel/sched/fair.c: In function 'task_numa_group':
>> include/asm-generic/rwonce.h:44:71: error: lvalue required as unary '&' operand
      44 | #define __READ_ONCE(x)  (*(const volatile __unqual_scalar_typeof(x) *)&(x))
         |                                                                       ^
   include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
      50 |         __READ_ONCE(x);                                                 \
         |         ^~~~~~~~~~~
   kernel/sched/fair.c:2750:15: note: in expansion of macro 'READ_ONCE'
    2750 |         tsk = READ_ONCE(cpu_curr(cpu));
         |               ^~~~~~~~~
   kernel/sched/fair.c: At top level:
   kernel/sched/fair.c:11908:6: warning: no previous prototype for 'task_vruntime_update' [-Wmissing-prototypes]
   11908 | void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi)
         |      ^~~~~~~~~~~~~~~~~~~~


vim +44 include/asm-generic/rwonce.h

e506ea451254ab Will Deacon 2019-10-15  28  
e506ea451254ab Will Deacon 2019-10-15  29  /*
e506ea451254ab Will Deacon 2019-10-15  30   * Yes, this permits 64-bit accesses on 32-bit architectures. These will
e506ea451254ab Will Deacon 2019-10-15  31   * actually be atomic in some cases (namely Armv7 + LPAE), but for others we
e506ea451254ab Will Deacon 2019-10-15  32   * rely on the access being split into 2x32-bit accesses for a 32-bit quantity
e506ea451254ab Will Deacon 2019-10-15  33   * (e.g. a virtual address) and a strong prevailing wind.
e506ea451254ab Will Deacon 2019-10-15  34   */
e506ea451254ab Will Deacon 2019-10-15  35  #define compiletime_assert_rwonce_type(t)					\
e506ea451254ab Will Deacon 2019-10-15  36  	compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long),	\
e506ea451254ab Will Deacon 2019-10-15  37  		"Unsupported access size for {READ,WRITE}_ONCE().")
e506ea451254ab Will Deacon 2019-10-15  38  
e506ea451254ab Will Deacon 2019-10-15  39  /*
e506ea451254ab Will Deacon 2019-10-15  40   * Use __READ_ONCE() instead of READ_ONCE() if you do not require any
3c9184109e78ea Will Deacon 2019-10-30  41   * atomicity. Note that this may result in tears!
e506ea451254ab Will Deacon 2019-10-15  42   */
b78b331a3f5c07 Will Deacon 2019-10-15  43  #ifndef __READ_ONCE
e506ea451254ab Will Deacon 2019-10-15 @44  #define __READ_ONCE(x)	(*(const volatile __unqual_scalar_typeof(x) *)&(x))
b78b331a3f5c07 Will Deacon 2019-10-15  45  #endif
e506ea451254ab Will Deacon 2019-10-15  46  

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