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authorLinus Torvalds <torvalds@linux-foundation.org>2021-10-03 10:49:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-10-03 10:49:00 -0700
commit777feabaea776a6bff3d198edfe931b0b45c45d9 (patch)
tree380445286456e8586142632e12ef68f9dcaa9ffa /kernel
parent3a399a2bc465e7fb0e788bfbffefc9399d628a25 (diff)
parent83d40a61046f73103b4e5d8f1310261487ff63b0 (diff)
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Merge tag 'sched_urgent_for_v5.15_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Borislav Petkov: - Tell the compiler to always inline is_percpu_thread() - Make sure tunable_scaling buffer is null-terminated after an update in sysfs - Fix LTP named regression due to cgroup list ordering * tag 'sched_urgent_for_v5.15_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched: Always inline is_percpu_thread() sched/fair: Null terminate buffer when updating tunable_scaling sched/fair: Add ancestors of unthrottled undecayed cfs_rq
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/debug.c8
-rw-r--r--kernel/sched/fair.c6
2 files changed, 12 insertions, 2 deletions
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 49716228efb4..17a653b67006 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -173,16 +173,22 @@ static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char buf[16];
+ unsigned int scaling;
if (cnt > 15)
cnt = 15;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
+ buf[cnt] = '\0';
- if (kstrtouint(buf, 10, &sysctl_sched_tunable_scaling))
+ if (kstrtouint(buf, 10, &scaling))
return -EINVAL;
+ if (scaling >= SCHED_TUNABLESCALING_END)
+ return -EINVAL;
+
+ sysctl_sched_tunable_scaling = scaling;
if (sched_update_scaling())
return -EINVAL;
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ff69f245b939..f6a05d9b5443 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4936,8 +4936,12 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
/* update hierarchical throttle state */
walk_tg_tree_from(cfs_rq->tg, tg_nop, tg_unthrottle_up, (void *)rq);
- if (!cfs_rq->load.weight)
+ /* Nothing to run but something to decay (on_list)? Complete the branch */
+ if (!cfs_rq->load.weight) {
+ if (cfs_rq->on_list)
+ goto unthrottle_throttle;
return;
+ }
task_delta = cfs_rq->h_nr_running;
idle_task_delta = cfs_rq->idle_h_nr_running;