[norov:total_cpus 1/2] include/linux/rcutiny.h:58:9: error: implicit declaration of function 'might_sleep'

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

tree:   https://github.com/norov/linux total_cpus
head:   57f6e7cf466e27e510bbc03cc2a5b067622f9673
commit: 3a8c8f12c46acd1541dbea31afaa96e8c4bf8177 [1/2] smp: include cpumask_types.h
config: alpha-allnoconfig (https://download.01.org/0day-ci/archive/20251113/202511131016.UXAXet0w-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251113/202511131016.UXAXet0w-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511131016.UXAXet0w-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:63,
                    from include/linux/sched.h:37,
                    from arch/alpha/kernel/asm-offsets.c:11:
   include/linux/smp.h: In function 'on_each_cpu':
   include/linux/smp.h:71:55: error: 'cpu_online_mask' undeclared (first use in this function)
      71 |         on_each_cpu_cond_mask(NULL, func, info, wait, cpu_online_mask);
         |                                                       ^~~~~~~~~~~~~~~
   include/linux/smp.h:71:55: note: each undeclared identifier is reported only once for each function it appears in
   include/linux/smp.h: In function 'on_each_cpu_cond':
   include/linux/smp.h:105:60: error: 'cpu_online_mask' undeclared (first use in this function)
     105 |         on_each_cpu_cond_mask(cond_func, func, info, wait, cpu_online_mask);
         |                                                            ^~~~~~~~~~~~~~~
   In file included from include/linux/rcupdate.h:291,
                    from include/linux/rculist.h:11,
                    from include/linux/sched/signal.h:5,
                    from include/linux/ptrace.h:7,
                    from arch/alpha/kernel/asm-offsets.c:12:
   include/linux/rcutiny.h: In function 'cond_synchronize_rcu':
>> include/linux/rcutiny.h:58:9: error: implicit declaration of function 'might_sleep' [-Wimplicit-function-declaration]
      58 |         might_sleep();
         |         ^~~~~~~~~~~
   In file included from include/linux/sched/task.h:13,
                    from include/linux/sched/signal.h:9:
   include/linux/uaccess.h: In function '__copy_from_user':
>> include/linux/uaccess.h:115:9: error: implicit declaration of function 'might_fault' [-Wimplicit-function-declaration]
     115 |         might_fault();
         |         ^~~~~~~~~~~
   In file included from include/linux/cpumask.h:11,
                    from include/linux/alloc_tag.h:13,
                    from include/linux/percpu.h:5,
                    from include/linux/percpu_counter.h:14,
                    from include/linux/sched/user.h:7,
                    from include/linux/cred.h:18,
                    from include/linux/sched/signal.h:10:
   include/linux/kernel.h: At top level:
>> include/linux/kernel.h:151:20: warning: conflicting types for 'might_fault'; have 'void(void)'
     151 | static inline void might_fault(void) { }
         |                    ^~~~~~~~~~~
>> include/linux/kernel.h:151:20: error: static declaration of 'might_fault' follows non-static declaration
   include/linux/uaccess.h:115:9: note: previous implicit declaration of 'might_fault' with type 'void(void)'
     115 |         might_fault();
         |         ^~~~~~~~~~~
   make[3]: *** [scripts/Makefile.build:182: arch/alpha/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1302: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/might_sleep +58 include/linux/rcutiny.h

91a967fd6934abc Paul E. McKenney 2022-07-28  55  
765a3f4fed708ae Paul E. McKenney 2014-03-14  56  static inline void cond_synchronize_rcu(unsigned long oldstate)
765a3f4fed708ae Paul E. McKenney 2014-03-14  57  {
765a3f4fed708ae Paul E. McKenney 2014-03-14 @58  	might_sleep();
b6fe4917ae4353b Paul E. McKenney 2022-08-04  59  }
b6fe4917ae4353b Paul E. McKenney 2022-08-04  60  

:::::: The code at line 58 was first introduced by commit
:::::: 765a3f4fed708ae429ee095914a7897acb3a65bd rcu: Provide grace-period piggybacking API

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

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