[openeuler:OLK-6.6 1540/1540] kernel/sched/bpf_sched.c:187:17: warning: no previous prototype for function 'bpf_sched_entity_is_task' - Kernel

29 Nov 2024


      tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   95bc69473a373c2e578d4fc39734e5811a03ead3
commit: 6f06e093b3708dcee5b7e4f0478e0206bc601da1 [1540/1540] sched/ebpf: Support task selection programmable
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20241129/202411290245.YQeCUdgI-lkp@i...)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241129/202411290245.YQeCUdgI-lkp@i...)
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/202411290245.YQeCUdgI-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from kernel/sched/build_utility.c:24:
   In file included from include/linux/cpuset.h:17:
   In file included from include/linux/mm.h:2247:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   In file included from kernel/sched/build_utility.c:113:
...
...
kernel/sched/bpf_sched.c:187:17: warning: no previous prototype for function 'bpf_sched_entity_is_task' [-Wmissing-prototypes]
187 | __bpf_kfunc int bpf_sched_entity_is_task(struct sched_entity *se)
         |                 ^
   kernel/sched/bpf_sched.c:187:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
     187 | __bpf_kfunc int bpf_sched_entity_is_task(struct sched_entity *se)
         |             ^
         |             static
...
...
kernel/sched/bpf_sched.c:195:33: warning: no previous prototype for function 'bpf_sched_entity_to_task' [-Wmissing-prototypes]
195 | __bpf_kfunc struct task_struct *bpf_sched_entity_to_task(struct sched_entity *se)
         |                                 ^
   kernel/sched/bpf_sched.c:195:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
     195 | __bpf_kfunc struct task_struct *bpf_sched_entity_to_task(struct sched_entity *se)
         |             ^
         |             static
...
...
kernel/sched/bpf_sched.c:203:18: warning: no previous prototype for function 'bpf_sched_tag_of_entity' [-Wmissing-prototypes]
203 | __bpf_kfunc long bpf_sched_tag_of_entity(struct sched_entity *se)
         |                  ^
   kernel/sched/bpf_sched.c:203:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
     203 | __bpf_kfunc long bpf_sched_tag_of_entity(struct sched_entity *se)
         |             ^
         |             static 
   8 warnings generated.
vim +/bpf_sched_entity_is_task +187 kernel/sched/bpf_sched.c
186
...
187	__bpf_kfunc int bpf_sched_entity_is_task(struct sched_entity *se)
188	{
   189		if (!se)
   190			return -EINVAL;
   191	
   192		return entity_is_task(se);
   193	}
   194
...
195	__bpf_kfunc struct task_struct *bpf_sched_entity_to_task(struct sched_entity *se)
196	{
   197		if (se && entity_is_task(se))
   198			return task_of(se);
   199	
   200		return NULL;
   201	}
   202
...
203	__bpf_kfunc long bpf_sched_tag_of_entity(struct sched_entity *se)
204	{
   205		if (!se)
   206			return -EINVAL;
   207	
   208		if (entity_is_task(se))
   209			return task_of(se)->tag;
   210	
   211		return group_cfs_rq(se)->tg->tag;
   212	}
   213
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