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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull scheduler fixes from Ingo Molnar:
 "Two rq-clock warnings related fixes, plus a cgroups related crash fix"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cgroup: Move sched_online_group() back into css_online() to fix crash
  sched/fair: Update rq clock before changing a task's CPU affinity
  sched/core: Fix update_rq_clock() splat on hotplug (and suspend/resume)
This commit is contained in:
Linus Torvalds 2017-02-28 11:44:01 -08:00
commit 65314ed08e
1 changed files with 17 additions and 12 deletions
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29
kernel/sched/core.c
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@ -1090,6 +1090,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
int ret = 0; int ret = 0;
rq = task_rq_lock(p, &rf); rq = task_rq_lock(p, &rf);
update_rq_clock(rq);
if (p->flags & PF_KTHREAD) { if (p->flags & PF_KTHREAD) {
/* /*
@ -5560,7 +5561,7 @@ static void migrate_tasks(struct rq *dead_rq)
{ {
struct rq *rq = dead_rq; struct rq *rq = dead_rq;
struct task_struct *next, *stop = rq->stop; struct task_struct *next, *stop = rq->stop;
struct rq_flags rf, old_rf; struct rq_flags rf;
int dest_cpu; int dest_cpu;
/* /*
@ -5579,7 +5580,9 @@ static void migrate_tasks(struct rq *dead_rq)
* class method both need to have an up-to-date * class method both need to have an up-to-date
* value of rq->clock[_task] * value of rq->clock[_task]
*/ */
rq_pin_lock(rq, &rf);
update_rq_clock(rq); update_rq_clock(rq);
rq_unpin_lock(rq, &rf);
for (;;) { for (;;) {
/* /*
@ -5592,7 +5595,7 @@ static void migrate_tasks(struct rq *dead_rq)
/* /*
* pick_next_task() assumes pinned rq->lock: * pick_next_task() assumes pinned rq->lock:
*/ */
rq_pin_lock(rq, &rf); rq_repin_lock(rq, &rf);
next = pick_next_task(rq, &fake_task, &rf); next = pick_next_task(rq, &fake_task, &rf);
BUG_ON(!next); BUG_ON(!next);
next->sched_class->put_prev_task(rq, next); next->sched_class->put_prev_task(rq, next);
@ -5621,13 +5624,6 @@ static void migrate_tasks(struct rq *dead_rq)
continue; continue;
} }
/*
* __migrate_task() may return with a different
* rq->lock held and a new cookie in 'rf', but we need
* to preserve rf::clock_update_flags for 'dead_rq'.
*/
old_rf = rf;
/* Find suitable destination for @next, with force if needed. */ /* Find suitable destination for @next, with force if needed. */
dest_cpu = select_fallback_rq(dead_rq->cpu, next); dest_cpu = select_fallback_rq(dead_rq->cpu, next);
@ -5636,7 +5632,6 @@ static void migrate_tasks(struct rq *dead_rq)
raw_spin_unlock(&rq->lock); raw_spin_unlock(&rq->lock);
rq = dead_rq; rq = dead_rq;
raw_spin_lock(&rq->lock); raw_spin_lock(&rq->lock);
rf = old_rf;
} }
raw_spin_unlock(&next->pi_lock); raw_spin_unlock(&next->pi_lock);
} }
@ -6819,11 +6814,20 @@ cpu_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
if (IS_ERR(tg)) if (IS_ERR(tg))
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
sched_online_group(tg, parent);
return &tg->css; return &tg->css;
} }
/* Expose task group only after completing cgroup initialization */
static int cpu_cgroup_css_online(struct cgroup_subsys_state *css)
{
struct task_group *tg = css_tg(css);
struct task_group *parent = css_tg(css->parent);
if (parent)
sched_online_group(tg, parent);
return 0;
}
static void cpu_cgroup_css_released(struct cgroup_subsys_state *css) static void cpu_cgroup_css_released(struct cgroup_subsys_state *css)
{ {
struct task_group *tg = css_tg(css); struct task_group *tg = css_tg(css);
@ -7229,6 +7233,7 @@ static struct cftype cpu_files[] = {
struct cgroup_subsys cpu_cgrp_subsys = { struct cgroup_subsys cpu_cgrp_subsys = {
.css_alloc = cpu_cgroup_css_alloc, .css_alloc = cpu_cgroup_css_alloc,
.css_online = cpu_cgroup_css_online,
.css_released = cpu_cgroup_css_released, .css_released = cpu_cgroup_css_released,
.css_free = cpu_cgroup_css_free, .css_free = cpu_cgroup_css_free,
.fork = cpu_cgroup_fork, .fork = cpu_cgroup_fork,