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sched/core: Use dl_bw_of() under rcu_read_lock_sched()

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As per commit f10e00f4bf ("sched/dl: Use dl_bw_of() under
rcu_read_lock_sched()"), dl_bw_of() has to be protected by
rcu_read_lock_sched().

Signed-off-by: Juri Lelli <juri.lelli@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1414497286-28824-1-git-send-email-juri.lelli@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Juri Lelli 2014-10-28 11:54:46 +00:00 committed by Ingo Molnar
parent 9f96742a13
commit 75e23e49db
1 changed files with 6 additions and 1 deletions
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7
kernel/sched/core.c
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@ -4661,6 +4661,7 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
struct dl_bw *cur_dl_b;
unsigned long flags;
rcu_read_lock_sched();
cur_dl_b = dl_bw_of(cpumask_any(cur));
trial_cpus = cpumask_weight(trial);
@ -4669,6 +4670,7 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
cur_dl_b->bw * trial_cpus < cur_dl_b->total_bw)
ret = 0;
raw_spin_unlock_irqrestore(&cur_dl_b->lock, flags);
rcu_read_unlock_sched();
return ret;
}
@ -4697,11 +4699,13 @@ int task_can_attach(struct task_struct *p,
cs_cpus_allowed)) {
unsigned int dest_cpu = cpumask_any_and(cpu_active_mask,
cs_cpus_allowed);
struct dl_bw *dl_b = dl_bw_of(dest_cpu);
struct dl_bw *dl_b;
bool overflow;
int cpus;
unsigned long flags;
rcu_read_lock_sched();
dl_b = dl_bw_of(dest_cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
cpus = dl_bw_cpus(dest_cpu);
overflow = __dl_overflow(dl_b, cpus, 0, p->dl.dl_bw);
@ -4717,6 +4721,7 @@ int task_can_attach(struct task_struct *p,
__dl_add(dl_b, p->dl.dl_bw);
}
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
}
#endif