linux-kernel - kernel/sched/ext.c:3538:31: warning: bitwise operation between different enumeration types ('enum scx_enq_flags' and 'enum scx_deq

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Message-ID: <202411110405.iwIkOMKq-lkp@intel.com>
Date: Mon, 11 Nov 2024 04:27:59 +0800
From: kernel test robot <lkp@...el.com>
To: Tejun Heo <tj@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: kernel/sched/ext.c:3538:31: warning: bitwise operation between
 different enumeration types ('enum scx_enq_flags' and 'enum scx_deq_flags')

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   de2f378f2b771b39594c04695feee86476743a69
commit: f0e1a0643a59bf1f922fa209cec86a170b784f3f sched_ext: Implement BPF extensible scheduler class
date:   5 months ago
config: powerpc-randconfig-r054-20241110 (https://download.01.org/0day-ci/archive/20241111/202411110405.iwIkOMKq-lkp@intel.com/config)
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/20241111/202411110405.iwIkOMKq-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411110405.iwIkOMKq-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:25:
   In file included from include/linux/livepatch.h:13:
   In file included from include/linux/ftrace.h:10:
   In file included from include/linux/trace_recursion.h:5:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:14:
   In file included from arch/powerpc/include/asm/io.h:24:
   In file included from include/linux/mm.h:2253:
   include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     514 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from kernel/sched/build_policy.c:61:
   kernel/sched/ext.c:3322:35: warning: bitwise operation between different enumeration types ('enum bpf_type_flag' and 'enum bpf_reg_type') [-Wenum-enum-conversion]
    3322 |                 info->reg_type = PTR_MAYBE_NULL | PTR_TO_BTF_ID | PTR_TRUSTED;
         |                                  ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~
>> kernel/sched/ext.c:3538:31: warning: bitwise operation between different enumeration types ('enum scx_enq_flags' and 'enum scx_deq_flags') [-Wenum-enum-conversion]
    3538 |         WRITE_ONCE(v, SCX_ENQ_WAKEUP | SCX_DEQ_SLEEP);
         |                       ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:61:18: note: expanded from macro 'WRITE_ONCE'
      61 |         __WRITE_ONCE(x, val);                                           \
         |                         ^~~
   include/asm-generic/rwonce.h:55:33: note: expanded from macro '__WRITE_ONCE'
      55 |         *(volatile typeof(x) *)&(x) = (val);                            \
         |                                        ^~~
   3 warnings generated.


vim +3538 kernel/sched/ext.c

  3523	
  3524	
  3525	/********************************************************************************
  3526	 * System integration and init.
  3527	 */
  3528	
  3529	void __init init_sched_ext_class(void)
  3530	{
  3531		s32 cpu, v;
  3532	
  3533		/*
  3534		 * The following is to prevent the compiler from optimizing out the enum
  3535		 * definitions so that BPF scheduler implementations can use them
  3536		 * through the generated vmlinux.h.
  3537		 */
> 3538		WRITE_ONCE(v, SCX_ENQ_WAKEUP | SCX_DEQ_SLEEP);
  3539	
  3540		BUG_ON(rhashtable_init(&dsq_hash, &dsq_hash_params));
  3541		init_dsq(&scx_dsq_global, SCX_DSQ_GLOBAL);
  3542	#ifdef CONFIG_SMP
  3543		BUG_ON(!alloc_cpumask_var(&idle_masks.cpu, GFP_KERNEL));
  3544		BUG_ON(!alloc_cpumask_var(&idle_masks.smt, GFP_KERNEL));
  3545	#endif
  3546		for_each_possible_cpu(cpu) {
  3547			struct rq *rq = cpu_rq(cpu);
  3548	
  3549			init_dsq(&rq->scx.local_dsq, SCX_DSQ_LOCAL);
  3550			INIT_LIST_HEAD(&rq->scx.runnable_list);
  3551		}
  3552	}
  3553	

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