lkml.org 
[lkml]   [2017]   [May]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/7] cpuset/sched: cpuset makes sense for SMP only
Date
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@linaro.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
\
 
 \ /
  Last update: 2017-05-29 23:20    [W:0.124 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site