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sched/cache: Fix rcu warning when accessing sd_llc domain

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rcu_dereference_all() should be used to access the
sd_llc domain under RCU protection.

This bug was reported by sashiko.

Fixes: df0d984759 ("sched/cache: Introduce infrastructure for cache-aware load balancing")
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Co-developed-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/2dc49455e861215d8059a1c877953f0b95990038.1778703694.git.tim.c.chen@linux.intel.com
This commit is contained in:
Chen Yu 2026-05-13 13:39:18 -07:00 committed by Peter Zijlstra
parent c1e7fe5e75
commit d943b86dfb
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/fair.c
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@ -1814,7 +1814,7 @@ static void task_cache_work(struct callback_head *work)
for_each_cpu(cpu, cpus) {
/* XXX sched_cluster_active */
struct sched_domain *sd = per_cpu(sd_llc, cpu);
struct sched_domain *sd = rcu_dereference_all(per_cpu(sd_llc, cpu));
unsigned long occ, m_occ = 0, a_occ = 0;
int m_cpu = -1, i;