* [tj-sched-ext:for-next 5/17] kernel/sched/ext/inlines.h:44:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
@ 2026-11-09 9:24 kernel test robot
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From: kernel test robot @ 2026-11-09 9:24 UTC (permalink / raw)
To: Tejun Heo; +Cc: oe-kbuild-all, Andrea Righi
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git for-next
head: 5372f91e6ac4d064ddd4eda4c93e0d528506fb1f
commit: 9ce6fca02867911ba79bc3664219effe8c7be8f4 [5/17] sched_ext: Fix stale pick when the donor changes during dispatch
config: arm-randconfig-r2305-20261109 (https://download.01.org/0day-ci/archive/20261109/202611091033.nhKyExPa-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
sparse: v0.6.5-rc1-21-g84ec0658
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261109/202611091033.nhKyExPa-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/202611091033.nhKyExPa-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
kernel/sched/ext/ext.c:11734:17: sparse: sparse: symbol 'scx_bpf_this_cid' was not declared. Should it be static?
kernel/sched/ext/ext.c:11749:34: sparse: sparse: symbol 'scx_bpf_get_possible_cpumask' was not declared. Should it be static?
kernel/sched/ext/ext.c:11757:34: sparse: sparse: symbol 'scx_bpf_get_online_cpumask' was not declared. Should it be static?
kernel/sched/ext/ext.c:11766:18: sparse: sparse: symbol 'scx_bpf_put_cpumask' was not declared. Should it be static?
kernel/sched/ext/ext.c:11794:17: sparse: sparse: symbol 'scx_bpf_task_cpu' was not declared. Should it be static?
kernel/sched/ext/ext.c:11807:17: sparse: sparse: symbol 'scx_bpf_task_cid' was not declared. Should it be static?
kernel/sched/ext/ext.c:11827:23: sparse: sparse: symbol 'scx_bpf_locked_rq' was not declared. Should it be static?
kernel/sched/ext/ext.c:11859:32: sparse: sparse: symbol 'scx_bpf_cpu_curr' was not declared. Should it be static?
kernel/sched/ext/ext.c:11883:32: sparse: sparse: symbol 'scx_bpf_cid_curr' was not declared. Should it be static?
kernel/sched/ext/ext.c:11908:32: sparse: sparse: symbol 'scx_bpf_tid_to_task' was not declared. Should it be static?
kernel/sched/ext/ext.c:11976:17: sparse: sparse: symbol 'scx_bpf_now' was not declared. Should it be static?
kernel/sched/ext/ext.c:12011:18: sparse: sparse: symbol 'scx_bpf_events' was not declared. Should it be static?
kernel/sched/build_policy.c: note: in included file:
kernel/sched/ext/cid.c:498:18: sparse: sparse: symbol 'scx_bpf_cid_override' was not declared. Should it be static?
kernel/sched/ext/cid.c:662:17: sparse: sparse: symbol 'scx_bpf_cid_to_cpu' was not declared. Should it be static?
kernel/sched/ext/cid.c:707:17: sparse: sparse: symbol 'scx_bpf_cpu_to_cid' was not declared. Should it be static?
kernel/sched/ext/cid.c:981:18: sparse: sparse: symbol 'scx_bpf_cid_topo' was not declared. Should it be static?
kernel/sched/build_policy.c: note: in included file:
kernel/sched/ext/idle.c:1067:17: sparse: sparse: symbol 'scx_bpf_cpu_node' was not declared. Should it be static?
kernel/sched/ext/idle.c:1150:1: sparse: sparse: symbol '__scx_bpf_select_cpu_and' was not declared. Should it be static?
kernel/sched/ext/idle.c:1169:17: sparse: sparse: symbol 'scx_bpf_select_cpu_and' was not declared. Should it be static?
kernel/sched/ext/idle.c:1212:34: sparse: sparse: symbol 'scx_bpf_get_idle_cpumask_node' was not declared. Should it be static?
kernel/sched/ext/idle.c:1270:34: sparse: sparse: symbol 'scx_bpf_get_idle_smtmask_node' was not declared. Should it be static?
kernel/sched/ext/idle.c:1389:17: sparse: sparse: symbol 'scx_bpf_pick_idle_cpu_node' was not declared. Should it be static?
kernel/sched/ext/idle.c:1475:17: sparse: sparse: symbol 'scx_bpf_pick_any_cpu_node' was not declared. Should it be static?
kernel/sched/build_policy.c: note: in included file:
kernel/sched/ext/sub.c:229:19: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/ext/sub.c:2861:17: sparse: sparse: symbol 'scx_bpf_sub_grant' was not declared. Should it be static?
kernel/sched/ext/sub.c:2992:18: sparse: sparse: symbol 'scx_bpf_sub_revoke' was not declared. Should it be static?
kernel/sched/ext/sub.c:3086:17: sparse: sparse: symbol 'scx_bpf_sub_caps' was not declared. Should it be static?
kernel/sched/ext/sub.c:3176:17: sparse: sparse: symbol 'scx_bpf_sub_kill_bstr' was not declared. Should it be static?
kernel/sched/build_policy.c: note: in included file:
kernel/sched/syscalls.c:1420:22: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/build_policy.c: note: in included file:
kernel/sched/rt.c:1313:23: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/rt.c:1313:23: sparse: struct task_struct *
kernel/sched/rt.c:1313:23: sparse: struct task_struct [noderef] __rcu *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/sched.h:2520:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2520:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2520:25: sparse: struct task_struct *
kernel/sched/sched.h:2520:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2520:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2520:25: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2520:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2520:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2520:25: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:1469:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:1469:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:1469:25: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/deadline.c:2340:15: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/deadline.c:2340:15: sparse: struct task_struct *
kernel/sched/deadline.c:2340:15: sparse: struct task_struct [noderef] __rcu *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/sched.h:2520:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2520:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2520:25: sparse: struct task_struct *
kernel/sched/sched.h:2520:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2520:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2520:25: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2520:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2520:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2520:25: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
>> kernel/sched/ext/inlines.h:44:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct *
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct [noderef] __rcu *
>> kernel/sched/ext/inlines.h:44:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct *
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct [noderef] __rcu *
>> kernel/sched/ext/inlines.h:44:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct *
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct [noderef] __rcu *
>> kernel/sched/ext/inlines.h:44:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct *
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct [noderef] __rcu *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/sched.h:2531:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2531:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2531:26: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
>> kernel/sched/ext/inlines.h:44:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct *
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct [noderef] __rcu *
>> kernel/sched/ext/inlines.h:44:66: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct *
kernel/sched/ext/inlines.h:44:66: sparse: struct task_struct [noderef] __rcu *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/sched.h:1469:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:1469:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:1469:25: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/syscalls.c:1345:11: sparse: sparse: dereference of noderef expression
kernel/sched/build_policy.c: note: in included file:
kernel/sched/rt.c:1680:15: sparse: sparse: dereference of noderef expression
vim +44 kernel/sched/ext/inlines.h
23
24 /**
25 * scx_dsp_prev_stale - Test whether dispatch's @prev went stale
26 * @rq: rq being dispatched for
27 * @prev: @rq's donor when dispatch started
28 *
29 * @prev can stop being @rq's donor while dispatch has the rq lock dropped. With
30 * proxy execution, @prev may not be the running task, and another CPU can reset
31 * the donor to rq->curr. With core scheduling, the core pick runs dispatch for
32 * the sibling rqs too, and a sibling can switch @prev out. Dispatch restarts
33 * the pick when that happened and doesn't hand the old donor to the BPF
34 * scheduler.
35 *
36 * With proxy execution alone, the donor only ever changes to rq->curr during a
37 * pick. Only __schedule() on this CPU sets a different donor, after the pick,
38 * so the restarted pick takes rq->curr as @prev and can't go stale again. Under
39 * core scheduling, the restart goes through the core pick, which already
40 * retries whenever dispatch dropped the lock.
41 */
42 static inline bool scx_dsp_prev_stale(struct rq *rq, struct task_struct *prev)
43 {
> 44 return (sched_proxy_exec() || sched_core_enabled(rq)) && unlikely(prev != rq->donor);
45 }
46
--
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https://github.com/intel/lkp-tests/wiki
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