From: Chen Yu Date: Wed, 13 May 2026 20:39:18 +0000 (-0700) Subject: sched/cache: Fix rcu warning when accessing sd_llc domain X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=d943b86dfbf4e9b76be30cf90b1b3f82ff9abbac;p=thirdparty%2Flinux.git sched/cache: Fix rcu warning when accessing sd_llc domain rcu_dereference_all() should be used to access the sd_llc domain under RCU protection. This bug was reported by sashiko. Fixes: df0d98475954 ("sched/cache: Introduce infrastructure for cache-aware load balancing") Signed-off-by: Chen Yu Co-developed-by: Tim Chen Signed-off-by: Tim Chen Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/2dc49455e861215d8059a1c877953f0b95990038.1778703694.git.tim.c.chen@linux.intel.com --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 76ac6a8100fc..c549ad489c6d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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;