[openeuler:openEuler-1.0-LTS 19851/23490] kernel/sched/rt.o: warning: objtool: dequeue_rt_stack()+0x1cf: unreachable instruction

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

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   ffc1b506e4066379411520003b9c59e509b05252
commit: 5635594b8e630f46bc2c98baf7f0ae95c1ad8d28 [19851/23490] nohz/full, sched/rt: Fix missed tick-reenabling bug in dequeue_task_rt()
config: x86_64-buildonly-randconfig-001-20240812 (https://download.01.org/0day-ci/archive/20240814/202408141237.n6rFrGmd-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240814/202408141237.n6rFrGmd-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/202408141237.n6rFrGmd-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/rt.c:6:
   In file included from kernel/sched/sched.h:52:
   In file included from include/linux/migrate.h:6:
   In file included from include/linux/mempolicy.h:16:
   include/linux/pagemap.h:425:21: warning: cast from 'int (*)(struct file *, struct page *)' to 'filler_t *' (aka 'int (*)(void *, struct page *)') converts to incompatible function type [-Wcast-function-type-strict]
     425 |         filler_t *filler = (filler_t *)mapping->a_ops->readpage;
         |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/rt.c:631:6: warning: no previous prototype for function 'sched_rt_bandwidth_account' [-Wmissing-prototypes]
     631 | bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
         |      ^
   kernel/sched/rt.c:631:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     631 | bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
         | ^
         | static 
   In file included from kernel/sched/rt.c:6:
   In file included from kernel/sched/sched.h:52:
   In file included from include/linux/migrate.h:6:
   include/linux/mempolicy.h:329:13: warning: unused function '__do_mbind' [-Wunused-function]
     329 | static long __do_mbind(unsigned long start, unsigned long len,
         |             ^~~~~~~~~~
   3 warnings generated.
>> kernel/sched/rt.o: warning: objtool: dequeue_rt_stack()+0x1cf: unreachable instruction

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