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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-08-11 13:14:58 (GMT) |
---|---|---|
committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:19:17 (GMT) |
commit | 2481a38554d43a00b23ecce4dd3175653b845e41 (patch) | |
tree | 5aa7c426ba030f745d2a99c409313a17f964bd7c /kernel | |
parent | 78211b80f38536b8e0e2dea5dddb665969fe4c0e (diff) | |
download | linux-fsl-qoriq-2481a38554d43a00b23ecce4dd3175653b845e41.tar.xz |
sched: Generic migrate_disable
Make migrate_disable() be a preempt_disable() for !rt kernels. This
allows generic code to use it but still enforces that these code
sections stay relatively small.
A preemptible migrate_disable() accessible for general use would allow
people growing arbitrary per-cpu crap instead of clean these things
up.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-275i87sl8e1jcamtchmehonm@git.kernel.org
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/sched/core.c | 6 | ||||
-rw-r--r-- | kernel/trace/trace.c | 2 |
2 files changed, 5 insertions, 3 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 8cdf838..17dc85f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4345,7 +4345,7 @@ void init_idle(struct task_struct *idle, int cpu) #ifdef CONFIG_SMP void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) { - if (!p->migrate_disable) { + if (!__migrate_disabled(p)) { if (p->sched_class && p->sched_class->set_cpus_allowed) p->sched_class->set_cpus_allowed(p, new_mask); p->nr_cpus_allowed = cpumask_weight(new_mask); @@ -4396,7 +4396,7 @@ int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) do_set_cpus_allowed(p, new_mask); /* Can the task run on the task's current CPU? If so, we're done */ - if (cpumask_test_cpu(task_cpu(p), new_mask) || p->migrate_disable) + if (cpumask_test_cpu(task_cpu(p), new_mask) || __migrate_disabled(p)) goto out; dest_cpu = cpumask_any_and(cpu_active_mask, new_mask); @@ -4415,6 +4415,7 @@ out: } EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr); +#ifdef CONFIG_PREEMPT_RT_FULL void migrate_disable(void) { struct task_struct *p = current; @@ -4507,6 +4508,7 @@ void migrate_enable(void) preempt_enable(); } EXPORT_SYMBOL(migrate_enable); +#endif /* CONFIG_PREEMPT_RT_FULL */ /* * Move (not current) task off this cpu, onto dest cpu. We're doing diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 4caf463..402fcc6 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1520,7 +1520,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); - entry->migrate_disable = (tsk) ? tsk->migrate_disable & 0xFF : 0; + entry->migrate_disable = (tsk) ? __migrate_disabled(tsk) & 0xFF : 0; } EXPORT_SYMBOL_GPL(tracing_generic_entry_update); |