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sched: Simplify sched_core_cpu_{starting,deactivate}()

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Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lore.kernel.org/r/20230801211812.371787909@infradead.org
This commit is contained in:
Peter Zijlstra 2023-08-01 22:41:30 +02:00
parent b4e1fa1e14
commit 7170509cad
1 changed files with 12 additions and 15 deletions
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27
kernel/sched/core.c
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@ -6400,20 +6400,24 @@ static void queue_core_balance(struct rq *rq)
queue_balance_callback(rq, &per_cpu(core_balance_head, rq->cpu), sched_core_balance);
}
DEFINE_LOCK_GUARD_1(core_lock, int,
sched_core_lock(*_T->lock, &_T->flags),
sched_core_unlock(*_T->lock, &_T->flags),
unsigned long flags)
static void sched_core_cpu_starting(unsigned int cpu)
{
const struct cpumask *smt_mask = cpu_smt_mask(cpu);
struct rq *rq = cpu_rq(cpu), *core_rq = NULL;
unsigned long flags;
int t;
sched_core_lock(cpu, &flags);
guard(core_lock)(&cpu);
WARN_ON_ONCE(rq->core != rq);
/* if we're the first, we'll be our own leader */
if (cpumask_weight(smt_mask) == 1)
goto unlock;
return;
/* find the leader */
for_each_cpu(t, smt_mask) {
@ -6427,7 +6431,7 @@ static void sched_core_cpu_starting(unsigned int cpu)
}
if (WARN_ON_ONCE(!core_rq)) /* whoopsie */
goto unlock;
return;
/* install and validate core_rq */
for_each_cpu(t, smt_mask) {
@ -6438,29 +6442,25 @@ static void sched_core_cpu_starting(unsigned int cpu)
WARN_ON_ONCE(rq->core != core_rq);
}
unlock:
sched_core_unlock(cpu, &flags);
}
static void sched_core_cpu_deactivate(unsigned int cpu)
{
const struct cpumask *smt_mask = cpu_smt_mask(cpu);
struct rq *rq = cpu_rq(cpu), *core_rq = NULL;
unsigned long flags;
int t;
sched_core_lock(cpu, &flags);
guard(core_lock)(&cpu);
/* if we're the last man standing, nothing to do */
if (cpumask_weight(smt_mask) == 1) {
WARN_ON_ONCE(rq->core != rq);
goto unlock;
return;
}
/* if we're not the leader, nothing to do */
if (rq->core != rq)
goto unlock;
return;
/* find a new leader */
for_each_cpu(t, smt_mask) {
@ -6471,7 +6471,7 @@ static void sched_core_cpu_deactivate(unsigned int cpu)
}
if (WARN_ON_ONCE(!core_rq)) /* impossible */
goto unlock;
return;
/* copy the shared state to the new leader */
core_rq->core_task_seq = rq->core_task_seq;
@ -6493,9 +6493,6 @@ static void sched_core_cpu_deactivate(unsigned int cpu)
rq = cpu_rq(t);
rq->core = core_rq;
}
unlock:
sched_core_unlock(cpu, &flags);
}
static inline void sched_core_cpu_dying(unsigned int cpu)