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sched/cpuset: Only offer CONFIG_CPUSETS if SMP is enabled 

Make CONFIG_CPUSETS=y depend on SMP as this feature makes no sense
on UP. This allows for configuring out cpuset_cpumask_can_shrink()
and task_can_attach() entirely, which shrinks the kernel a bit.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170614171926.8345-2-nicolas.pitre@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
zero-colors
Nicolas Pitre 2017-06-14 13:19:23 -04:00 committed by Ingo Molnar
parent 387bc8b553
commit e1d4eeec5a
2 changed files with 4 additions and 4 deletions
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1
init/Kconfig
View File

@ -1156,6 +1156,7 @@ config CGROUP_HUGETLB
config CPUSETS
bool "Cpuset controller"
depends on SMP
help
This option will let you create and manage CPUSETs which
allow dynamically partitioning a system into sets of CPUs and

7
kernel/sched/core.c
View File

@ -5451,6 +5451,8 @@ void init_idle(struct task_struct *idle, int cpu)
#endif
}
#ifdef CONFIG_SMP
int cpuset_cpumask_can_shrink(const struct cpumask *cur,
const struct cpumask *trial)
{
@ -5494,7 +5496,6 @@ int task_can_attach(struct task_struct *p,
goto out;
}
#ifdef CONFIG_SMP
if (dl_task(p) && !cpumask_intersects(task_rq(p)->rd->span,
cs_cpus_allowed)) {
unsigned int dest_cpu = cpumask_any_and(cpu_active_mask,
@ -5524,13 +5525,11 @@ int task_can_attach(struct task_struct *p,
rcu_read_unlock_sched();
}
#endif
out:
return ret;
}
#ifdef CONFIG_SMP
bool sched_smp_initialized __read_mostly;
#ifdef CONFIG_NUMA_BALANCING