[tip:sched/core 2/14] kernel/sched/topology.c:2604:16: sparse: sparse: incorrect type in assignment (different address spaces)
From: kernel test robot
Date: Mon Apr 13 2026 - 10:55:57 EST
Hi Prateek,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
head: 78cde54ea5f03398f1cf6656de2472068f6da966
commit: 5a7b576b3ec1acc2694c5b58f80cd1d44a11b2c1 [2/14] sched/topology: Extract "imb_numa_nr" calculation into a separate helper
config: um-randconfig-r132-20260413 (https://download.01.org/0day-ci/archive/20260413/202604132237.KvYYVxjN-lkp@xxxxxxxxx/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260413/202604132237.KvYYVxjN-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604132237.KvYYVxjN-lkp@xxxxxxxxx/
sparse warnings: (new ones prefixed by >>)
kernel/sched/build_utility.c: note: in included file:
kernel/sched/debug.c:730:17: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/debug.c:730:17: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/debug.c:730:17: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/debug.c:1069:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/debug.c:1069:9: sparse: expected struct task_struct *tsk
kernel/sched/debug.c:1069:9: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/debug.c:1069:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/debug.c:1069:9: sparse: expected struct task_struct *tsk
kernel/sched/debug.c:1069:9: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/build_utility.c: note: in included file:
kernel/sched/stats.c:136:17: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/stats.c:136:17: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/stats.c:136:17: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/build_utility.c: note: in included file:
kernel/sched/topology.c:116:56: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:116:56: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:116:56: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:135:60: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:135:60: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:135:60: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:158:20: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:158:20: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:158:20: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:469:19: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct perf_domain *pd @@ got struct perf_domain [noderef] __rcu *pd @@
kernel/sched/topology.c:469:19: sparse: expected struct perf_domain *pd
kernel/sched/topology.c:469:19: sparse: got struct perf_domain [noderef] __rcu *pd
kernel/sched/topology.c:644:49: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain *parent @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:644:49: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:644:49: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:729:50: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain *parent @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:729:50: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:729:50: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:737:55: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain [noderef] __rcu *[noderef] __rcu child @@ got struct sched_domain *[assigned] tmp @@
kernel/sched/topology.c:737:55: sparse: expected struct sched_domain [noderef] __rcu *[noderef] __rcu child
kernel/sched/topology.c:737:55: sparse: got struct sched_domain *[assigned] tmp
kernel/sched/topology.c:750:29: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] tmp @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:750:29: sparse: expected struct sched_domain *[assigned] tmp
kernel/sched/topology.c:750:29: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:755:20: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:755:20: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:755:20: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:776:13: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] tmp @@ got struct sched_domain [noderef] __rcu *sd @@
kernel/sched/topology.c:776:13: sparse: expected struct sched_domain *[assigned] tmp
kernel/sched/topology.c:776:13: sparse: got struct sched_domain [noderef] __rcu *sd
kernel/sched/topology.c:938:70: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:938:70: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:938:70: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:967:59: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:967:59: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:967:59: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1013:57: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:1013:57: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:1013:57: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1015:25: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *sibling @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:1015:25: sparse: expected struct sched_domain *sibling
kernel/sched/topology.c:1015:25: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1023:55: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:1023:55: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:1023:55: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1025:25: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *sibling @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:1025:25: sparse: expected struct sched_domain *sibling
kernel/sched/topology.c:1025:25: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1095:62: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_domain *sd @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:1095:62: sparse: expected struct sched_domain *sd
kernel/sched/topology.c:1095:62: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1199:40: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain *child @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/topology.c:1199:40: sparse: expected struct sched_domain *child
kernel/sched/topology.c:1199:40: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1337:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:1337:9: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/topology.c:1337:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:1692:43: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain [noderef] __rcu *child @@ got struct sched_domain *child @@
kernel/sched/topology.c:1692:43: sparse: expected struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1692:43: sparse: got struct sched_domain *child
kernel/sched/topology.c:2476:31: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain [noderef] __rcu *parent @@ got struct sched_domain *sd @@
kernel/sched/topology.c:2476:31: sparse: expected struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2476:31: sparse: got struct sched_domain *sd
>> kernel/sched/topology.c:2604:16: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *parent @@ got struct sched_domain [noderef] __rcu *[noderef] __rcu parent @@
kernel/sched/topology.c:2604:16: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2604:16: sparse: got struct sched_domain [noderef] __rcu *[noderef] __rcu parent
>> kernel/sched/topology.c:2606:24: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *parent @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:2606:24: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2606:24: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2611:16: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *parent @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:2611:16: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2611:16: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2616:24: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *parent @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:2616:24: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2616:24: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2665:57: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:2665:57: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/topology.c:2665:57: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2684:28: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:2684:28: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/topology.c:2684:28: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2699:57: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/topology.c:2699:57: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/topology.c:2699:57: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/build_utility.c: note: in included file:
kernel/sched/build_utility.c: note: in included file:
kernel/sched/sched.h:2367:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2367:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2367:25: sparse: struct task_struct *
vim +2604 kernel/sched/topology.c
2551
2552 /*
2553 * Calculate an allowed NUMA imbalance such that LLCs do not get
2554 * imbalanced.
2555 */
2556 static void adjust_numa_imbalance(struct sched_domain *sd_llc)
2557 {
2558 struct sched_domain *parent;
2559 unsigned int imb_span = 1;
2560 unsigned int imb = 0;
2561 unsigned int nr_llcs;
2562
2563 WARN_ON(!(sd_llc->flags & SD_SHARE_LLC));
2564 WARN_ON(!sd_llc->parent);
2565
2566 /*
2567 * For a single LLC per node, allow an
2568 * imbalance up to 12.5% of the node. This is
2569 * arbitrary cutoff based two factors -- SMT and
2570 * memory channels. For SMT-2, the intent is to
2571 * avoid premature sharing of HT resources but
2572 * SMT-4 or SMT-8 *may* benefit from a different
2573 * cutoff. For memory channels, this is a very
2574 * rough estimate of how many channels may be
2575 * active and is based on recent CPUs with
2576 * many cores.
2577 *
2578 * For multiple LLCs, allow an imbalance
2579 * until multiple tasks would share an LLC
2580 * on one node while LLCs on another node
2581 * remain idle. This assumes that there are
2582 * enough logical CPUs per LLC to avoid SMT
2583 * factors and that there is a correlation
2584 * between LLCs and memory channels.
2585 */
2586 nr_llcs = sd_llc->parent->span_weight / sd_llc->span_weight;
2587 if (nr_llcs == 1)
2588 imb = sd_llc->parent->span_weight >> 3;
2589 else
2590 imb = nr_llcs;
2591
2592 imb = max(1U, imb);
2593 sd_llc->parent->imb_numa_nr = imb;
2594
2595 /*
2596 * Set span based on the first NUMA domain.
2597 *
2598 * NUMA systems always add a NODE domain before
2599 * iterating the NUMA domains. Since this is before
2600 * degeneration, start from sd_llc's parent's
2601 * parent which is the lowest an SD_NUMA domain can
2602 * be relative to sd_llc.
2603 */
> 2604 parent = sd_llc->parent->parent;
2605 while (parent && !(parent->flags & SD_NUMA))
> 2606 parent = parent->parent;
2607
2608 imb_span = parent ? parent->span_weight : sd_llc->parent->span_weight;
2609
2610 /* Update the upper remainder of the topology */
2611 parent = sd_llc->parent;
2612 while (parent) {
2613 int factor = max(1U, (parent->span_weight / imb_span));
2614
2615 parent->imb_numa_nr = imb * factor;
2616 parent = parent->parent;
2617 }
2618 }
2619
--
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