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Date: Tue, 6 Jun 2017 19:24:43 -0400 From: Nicolas Pitre <nicolas.pitre@...aro.org> To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: linux-kernel@...r.kernel.org Subject: [PATCH v2 1/8] cpuset/sched: cpuset makes sense for SMP only Make CONFIG_CPUSETS 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. Signed-off-by: Nicolas Pitre <nico@...aro.org> --- init/Kconfig | 1 + kernel/sched/core.c | 7 +++---- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index 4ef946b466..b9aed60cac 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -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 diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 803c3bc274..de274b1bd2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5463,6 +5463,8 @@ 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) { @@ -5506,7 +5508,6 @@ 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, @@ -5536,13 +5537,11 @@ 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 -- 2.9.4
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