Re: [PATCH 1/5] sched: Split out kernel/sched/syscalls.c from kernel/sched/core.c

[kernel test robot]

Hi Ingo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on linux/master linus/master peterz-queue/sched/core v6.9-rc2 next-20240405]
[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/Ingo-Molnar/sched-Split-out-kernel-sched-syscalls-c-from-kernel-sched-core-c/20240407-164646
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20240407084319.1462211-2-mingo%40kernel.org
patch subject: [PATCH 1/5] sched: Split out kernel/sched/syscalls.c from kernel/sched/core.c
config: i386-randconfig-061-20240408 (https://download.01.org/0day-ci/archive/20240408/202404080226.2qQ925j2-lkp@xxxxxxxxx/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240408/202404080226.2qQ925j2-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404080226.2qQ925j2-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> kernel/sched/syscalls.c:197:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/syscalls.c:197:22: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/syscalls.c:197:22: sparse:    struct task_struct *
   kernel/sched/syscalls.c: note: in included file:
   kernel/sched/sched.h:2172:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2172:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2172:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2344:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2344:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2344:9: sparse:    struct task_struct *
   kernel/sched/sched.h:2172:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2172:25: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2172:25: sparse:    struct task_struct *
   kernel/sched/sched.h:2344:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/sched/sched.h:2344:9: sparse:    struct task_struct [noderef] __rcu *
   kernel/sched/sched.h:2344:9: sparse:    struct task_struct *
   kernel/sched/syscalls.c:1228:5: sparse: sparse: context imbalance in 'dl_task_check_affinity' - wrong count at exit
   kernel/sched/syscalls.c:1331:9: sparse: sparse: context imbalance in 'sched_setaffinity' - different lock contexts for basic block
   kernel/sched/syscalls.c:1393:6: sparse: sparse: context imbalance in 'sched_getaffinity' - wrong count at exit

vim +197 kernel/sched/syscalls.c

   186	
   187	/**
   188	 * idle_cpu - is a given CPU idle currently?
   189	 * @cpu: the processor in question.
   190	 *
   191	 * Return: 1 if the CPU is currently idle. 0 otherwise.
   192	 */
   193	int idle_cpu(int cpu)
   194	{
   195		struct rq *rq = cpu_rq(cpu);
   196	
 > 197		if (rq->curr != rq->idle)
   198			return 0;
   199	
   200		if (rq->nr_running)
   201			return 0;
   202	

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