From: kernel test robot <lkp@intel.com>
To: K Prateek Nayak <kprateek.nayak@amd.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Valentin Schneider <vschneid@redhat.com>,
linux-kernel@vger.kernel.org
Cc: oe-kbuild-all@lists.linux.dev,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Chen Yu <yu.c.chen@intel.com>,
Shrikanth Hegde <sshegde@linux.ibm.com>,
Li Chen <chenl311@chinatelecom.cn>,
"Gautham R. Shenoy" <gautham.shenoy@amd.com>,
K Prateek Nayak <kprateek.nayak@amd.com>
Subject: Re: [PATCH v4 2/9] sched/topology: Extract "imb_numa_nr" calculation into a separate helper
Date: Thu, 12 Mar 2026 21:37:35 +0800 [thread overview]
Message-ID: <202603122149.xyvcIkPY-lkp@intel.com> (raw)
In-Reply-To: <20260312044434.1974-3-kprateek.nayak@amd.com>
Hi Prateek,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 54a66e431eeacf23e1dc47cb3507f2d0c068aaf0]
url: https://github.com/intel-lab-lkp/linux/commits/K-Prateek-Nayak/sched-topology-Compute-sd_weight-considering-cpuset-partitions/20260312-125021
base: 54a66e431eeacf23e1dc47cb3507f2d0c068aaf0
patch link: https://lore.kernel.org/r/20260312044434.1974-3-kprateek.nayak%40amd.com
patch subject: [PATCH v4 2/9] sched/topology: Extract "imb_numa_nr" calculation into a separate helper
config: nios2-randconfig-r131-20260312 (https://download.01.org/0day-ci/archive/20260312/202603122149.xyvcIkPY-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260312/202603122149.xyvcIkPY-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/202603122149.xyvcIkPY-lkp@intel.com/
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:1683:43: 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:1683:43: sparse: expected struct sched_domain [noderef] __rcu *child
kernel/sched/topology.c:1683:43: sparse: got struct sched_domain *child
kernel/sched/topology.c:2478:31: 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:2478:31: sparse: expected struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2478:31: sparse: got struct sched_domain *sd
>> kernel/sched/topology.c:2606:16: 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:2606:16: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2606:16: sparse: got struct sched_domain [noderef] __rcu *[noderef] __rcu parent
>> kernel/sched/topology.c:2608:24: 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:2608:24: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2608:24: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2613:16: 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:2613:16: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2613:16: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2618:24: 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:2618:24: sparse: expected struct sched_domain *parent
kernel/sched/topology.c:2618:24: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2667:57: 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:2667:57: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/topology.c:2667:57: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2686:28: 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:2686:28: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/topology.c:2686:28: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/topology.c:2701:57: 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:2701:57: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/topology.c:2701:57: 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 +2606 kernel/sched/topology.c
2553
2554 /*
2555 * Calculate an allowed NUMA imbalance such that LLCs do not get
2556 * imbalanced.
2557 */
2558 static void adjust_numa_imbalance(struct sched_domain *sd_llc)
2559 {
2560 struct sched_domain *parent;
2561 unsigned int imb_span = 1;
2562 unsigned int imb = 0;
2563 unsigned int nr_llcs;
2564
2565 WARN_ON(!(sd_llc->flags & SD_SHARE_LLC));
2566 WARN_ON(!sd_llc->parent);
2567
2568 /*
2569 * For a single LLC per node, allow an
2570 * imbalance up to 12.5% of the node. This is
2571 * arbitrary cutoff based two factors -- SMT and
2572 * memory channels. For SMT-2, the intent is to
2573 * avoid premature sharing of HT resources but
2574 * SMT-4 or SMT-8 *may* benefit from a different
2575 * cutoff. For memory channels, this is a very
2576 * rough estimate of how many channels may be
2577 * active and is based on recent CPUs with
2578 * many cores.
2579 *
2580 * For multiple LLCs, allow an imbalance
2581 * until multiple tasks would share an LLC
2582 * on one node while LLCs on another node
2583 * remain idle. This assumes that there are
2584 * enough logical CPUs per LLC to avoid SMT
2585 * factors and that there is a correlation
2586 * between LLCs and memory channels.
2587 */
2588 nr_llcs = sd_llc->parent->span_weight / sd_llc->span_weight;
2589 if (nr_llcs == 1)
2590 imb = sd_llc->parent->span_weight >> 3;
2591 else
2592 imb = nr_llcs;
2593
2594 imb = max(1U, imb);
2595 sd_llc->parent->imb_numa_nr = imb;
2596
2597 /*
2598 * Set span based on the first NUMA domain.
2599 *
2600 * NUMA systems always add a NODE domain before
2601 * iterating the NUMA domains. Since this is before
2602 * degeneration, start from sd_llc's parent's
2603 * parent which is the lowest an SD_NUMA domain can
2604 * be relative to sd_llc.
2605 */
> 2606 parent = sd_llc->parent->parent;
2607 while (parent && !(parent->flags & SD_NUMA))
> 2608 parent = parent->parent;
2609
2610 imb_span = parent ? parent->span_weight : sd_llc->parent->span_weight;
2611
2612 /* Update the upper remainder of the topology */
2613 parent = sd_llc->parent;
2614 while (parent) {
2615 int factor = max(1U, (parent->span_weight / imb_span));
2616
2617 parent->imb_numa_nr = imb * factor;
2618 parent = parent->parent;
2619 }
2620 }
2621
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2026-03-12 13:38 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-12 4:44 [PATCH v4 0/9] sched/topology: Optimize sd->shared allocation K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 1/9] sched/topology: Compute sd_weight considering cpuset partitions K Prateek Nayak
2026-03-12 9:34 ` Peter Zijlstra
2026-03-12 9:59 ` K Prateek Nayak
2026-03-12 10:01 ` Peter Zijlstra
2026-03-12 10:09 ` K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-20 23:58 ` Nathan Chancellor
2026-03-21 3:36 ` K Prateek Nayak
2026-03-21 7:33 ` Chen, Yu C
2026-03-21 7:47 ` Chen, Yu C
2026-03-21 8:59 ` K Prateek Nayak
2026-03-21 9:45 ` K Prateek Nayak
2026-03-21 10:13 ` K Prateek Nayak
2026-03-21 12:48 ` Chen, Yu C
2026-03-24 2:54 ` K Prateek Nayak
2026-03-21 14:13 ` Shrikanth Hegde
2026-03-21 15:14 ` K Prateek Nayak
2026-03-21 16:38 ` [PATCH] sched/topology: Initialize sd_span after assignment to *sd K Prateek Nayak
2026-03-23 9:08 ` Shrikanth Hegde
2026-03-23 17:34 ` K Prateek Nayak
2026-03-23 9:36 ` Peter Zijlstra
2026-03-23 13:24 ` Jon Hunter
2026-03-23 15:36 ` Chen, Yu C
2026-03-23 17:24 ` K Prateek Nayak
2026-03-23 22:41 ` Nathan Chancellor
2026-03-24 9:10 ` [tip: sched/core] sched/topology: Fix sched_domain_span() tip-bot2 for Peter Zijlstra
2026-03-12 4:44 ` [PATCH v4 2/9] sched/topology: Extract "imb_numa_nr" calculation into a separate helper K Prateek Nayak
2026-03-12 13:37 ` kernel test robot [this message]
2026-03-12 15:42 ` K Prateek Nayak
2026-03-12 16:02 ` Peter Zijlstra
2026-03-16 0:18 ` Dietmar Eggemann
2026-03-16 3:41 ` K Prateek Nayak
2026-03-16 8:24 ` Dietmar Eggemann
2026-03-16 8:50 ` K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 3/9] sched/topology: Allocate per-CPU sched_domain_shared in s_data K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 4/9] sched/topology: Switch to assigning "sd->shared" from s_data K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 5/9] sched/topology: Remove sched_domain_shared allocation with sd_data K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 6/9] sched/core: Check for rcu_read_lock_any_held() in idle_get_state() K Prateek Nayak
2026-03-12 9:46 ` Peter Zijlstra
2026-03-12 10:06 ` K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 7/9] sched/fair: Remove superfluous rcu_read_lock() in the wakeup path K Prateek Nayak
2026-03-15 23:36 ` Dietmar Eggemann
2026-03-16 3:19 ` K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] PM: EM: Switch to rcu_dereference_all() in " tip-bot2 for Dietmar Eggemann
2026-03-18 8:08 ` [tip: sched/core] sched/fair: Remove superfluous rcu_read_lock() in the " tip-bot2 for K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 8/9] sched/fair: Simplify the entry condition for update_idle_cpu_scan() K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-12 4:44 ` [PATCH v4 9/9] sched/fair: Simplify SIS_UTIL handling in select_idle_cpu() K Prateek Nayak
2026-03-18 8:08 ` [tip: sched/core] " tip-bot2 for K Prateek Nayak
2026-03-16 0:22 ` [PATCH v4 0/9] sched/topology: Optimize sd->shared allocation Dietmar Eggemann
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