Re: [PATCH] dl_server: Reset DL server params when rd changes

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

Hi Joel,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on linus/master v6.12-rc5 next-20241030]
[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/Joel-Fernandes-Google/dl_server-Reset-DL-server-params-when-rd-changes/20241030-065241
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20241029225116.3998487-1-joel%40joelfernandes.org
patch subject: [PATCH] dl_server: Reset DL server params when rd changes
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20241031/202410310046.qSHsY4dH-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 639a7ac648f1e50ccd2556e17d401c04f9cce625)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241031/202410310046.qSHsY4dH-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/202410310046.qSHsY4dH-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:19:
   In file included from include/linux/sched/isolation.h:5:
   In file included from include/linux/cpuset.h:17:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from kernel/sched/build_policy.c:60:
>> kernel/sched/deadline.c:1631:40: error: no member named 'rd' in 'struct rq'
    1631 |         struct root_domain *rd = cpu_rq(cpu)->rd;
         |                                  ~~~~~~~~~~~  ^
   1 warning and 1 error generated.


vim +1631 kernel/sched/deadline.c

  1626	
  1627	void dl_server_start(struct sched_dl_entity *dl_se)
  1628	{
  1629		struct rq *rq = dl_se->rq;
  1630		int cpu = cpu_of(rq);
> 1631		struct root_domain *rd = cpu_rq(cpu)->rd;
  1632	
  1633		/*
  1634		 * XXX: the apply do not work fine at the init phase for the
  1635		 * fair server because things are not yet set. We need to improve
  1636		 * this before getting generic.
  1637		 */
  1638		if (!dl_server(dl_se) || dl_se->last_rd != rd) {
  1639			u64 runtime =  50 * NSEC_PER_MSEC;
  1640			u64 period = 1000 * NSEC_PER_MSEC;
  1641	
  1642			dl_se->last_rd = rd;
  1643			dl_server_apply_params(dl_se, runtime, period, 1);
  1644	
  1645			if (!dl_server(dl_se)) {
  1646				dl_se->dl_server = 1;
  1647				dl_se->dl_defer = 1;
  1648				setup_new_dl_entity(dl_se);
  1649			}
  1650		}
  1651	
  1652		if (!dl_se->dl_runtime)
  1653			return;
  1654	
  1655		enqueue_dl_entity(dl_se, ENQUEUE_WAKEUP);
  1656		if (!dl_task(dl_se->rq->curr) || dl_entity_preempt(dl_se, &rq->curr->dl))
  1657			resched_curr(dl_se->rq);
  1658	}
  1659	

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