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authorLinus Torvalds <torvalds@linux-foundation.org>2022-08-06 17:34:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-06 17:34:06 -0700
commitcac03ac368fabff0122853de2422d4e17a32de08 (patch)
tree24ce8d511fc5a6a7a78e48d087eb30965336a5b0 /kernel
parent592d8362bc2526bbb08cf7d258661691e957b5ea (diff)
parent751d4cbc43879229dbc124afefe240b70fd29a85 (diff)
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Merge tag 'sched-urgent-2022-08-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Ingo Molnar: "Various fixes: a deadline scheduler fix, a migration fix, a Sparse fix and a comment fix" * tag 'sched-urgent-2022-08-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/core: Do not requeue task on CPU excluded from cpus_mask sched/rt: Fix Sparse warnings due to undefined rt.c declarations exit: Fix typo in comment: s/sub-theads/sub-threads sched, cpuset: Fix dl_cpu_busy() panic due to empty cs->cpus_allowed
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup/cpuset.c2
-rw-r--r--kernel/exit.c2
-rw-r--r--kernel/sched/core.c16
-rw-r--r--kernel/sched/sched.h7
4 files changed, 17 insertions, 10 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 71a418858a5e..58aadfda9b8b 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -2239,7 +2239,7 @@ static int cpuset_can_attach(struct cgroup_taskset *tset)
goto out_unlock;
cgroup_taskset_for_each(task, css, tset) {
- ret = task_can_attach(task, cs->cpus_allowed);
+ ret = task_can_attach(task, cs->effective_cpus);
if (ret)
goto out_unlock;
ret = security_task_setscheduler(task);
diff --git a/kernel/exit.c b/kernel/exit.c
index 64c938ce36fe..84021b24f79e 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1051,7 +1051,7 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
* p->signal fields because the whole thread group is dead
* and nobody can change them.
*
- * psig->stats_lock also protects us from our sub-theads
+ * psig->stats_lock also protects us from our sub-threads
* which can reap other children at the same time. Until
* we change k_getrusage()-like users to rely on this lock
* we have to take ->siglock as well.
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 189999007f32..ee28253c9ac0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3802,7 +3802,7 @@ bool cpus_share_cache(int this_cpu, int that_cpu)
return per_cpu(sd_llc_id, this_cpu) == per_cpu(sd_llc_id, that_cpu);
}
-static inline bool ttwu_queue_cond(int cpu)
+static inline bool ttwu_queue_cond(struct task_struct *p, int cpu)
{
/*
* Do not complicate things with the async wake_list while the CPU is
@@ -3811,6 +3811,10 @@ static inline bool ttwu_queue_cond(int cpu)
if (!cpu_active(cpu))
return false;
+ /* Ensure the task will still be allowed to run on the CPU. */
+ if (!cpumask_test_cpu(cpu, p->cpus_ptr))
+ return false;
+
/*
* If the CPU does not share cache, then queue the task on the
* remote rqs wakelist to avoid accessing remote data.
@@ -3840,7 +3844,7 @@ static inline bool ttwu_queue_cond(int cpu)
static bool ttwu_queue_wakelist(struct task_struct *p, int cpu, int wake_flags)
{
- if (sched_feat(TTWU_QUEUE) && ttwu_queue_cond(cpu)) {
+ if (sched_feat(TTWU_QUEUE) && ttwu_queue_cond(p, cpu)) {
sched_clock_cpu(cpu); /* Sync clocks across CPUs */
__ttwu_queue_wakelist(p, cpu, wake_flags);
return true;
@@ -9012,7 +9016,7 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
}
int task_can_attach(struct task_struct *p,
- const struct cpumask *cs_cpus_allowed)
+ const struct cpumask *cs_effective_cpus)
{
int ret = 0;
@@ -9031,9 +9035,11 @@ int task_can_attach(struct task_struct *p,
}
if (dl_task(p) && !cpumask_intersects(task_rq(p)->rd->span,
- cs_cpus_allowed)) {
- int cpu = cpumask_any_and(cpu_active_mask, cs_cpus_allowed);
+ cs_effective_cpus)) {
+ int cpu = cpumask_any_and(cpu_active_mask, cs_effective_cpus);
+ if (unlikely(cpu >= nr_cpu_ids))
+ return -EINVAL;
ret = dl_cpu_busy(cpu, p);
}
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index a6f071b2acac..e26688d387ae 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -481,9 +481,6 @@ extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b);
extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
-extern void unregister_rt_sched_group(struct task_group *tg);
-extern void free_rt_sched_group(struct task_group *tg);
-extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
struct sched_rt_entity *rt_se, int cpu,
struct sched_rt_entity *parent);
@@ -521,6 +518,10 @@ struct cfs_bandwidth { };
#endif /* CONFIG_CGROUP_SCHED */
+extern void unregister_rt_sched_group(struct task_group *tg);
+extern void free_rt_sched_group(struct task_group *tg);
+extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
+
/*
* u64_u32_load/u64_u32_store
*