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Commit e1d4eeec authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Ingo Molnar
Browse files

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: default avatarNicolas 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: default avatarIngo Molnar <mingo@kernel.org>
parent 387bc8b5

init/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

kernel/sched/core.c

+3 −4
Original line number Diff line number Diff line
@@ -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