From 853b061ed11ac48ea361d2d5d4c3f9953b483bc1 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 25 Apr 2017 15:29:40 +0200
Subject: [PATCH] sched/topology: Small cleanup

References: bnc#978907 Scheduler performance -- topology
Patch-mainline: v4.13-rc1
Git-commit: 8d5dc5126bb2bbcebf0b1e061cca2fc02c935620

Move the allocation of topology specific cpumasks into the topology
code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 kernel/sched/core.c     | 4 +---
 kernel/sched/sched.h    | 4 +---
 kernel/sched/topology.c | 7 +++++--
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 326d4f88e2b1..3223905b96de 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5958,7 +5958,6 @@ void __init sched_init_smp(void)
 	cpumask_var_t non_isolated_cpus;
 
 	alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL);
-	alloc_cpumask_var(&fallback_doms, GFP_KERNEL);
 
 	sched_init_numa();
 
@@ -5968,7 +5967,7 @@ void __init sched_init_smp(void)
 	 * happen.
 	 */
 	mutex_lock(&sched_domains_mutex);
-	init_sched_domains(cpu_active_mask);
+	sched_init_domains(cpu_active_mask);
 	cpumask_andnot(non_isolated_cpus, cpu_possible_mask, cpu_isolated_map);
 	if (cpumask_empty(non_isolated_cpus))
 		cpumask_set_cpu(smp_processor_id(), non_isolated_cpus);
@@ -6199,7 +6198,6 @@ void __init sched_init(void)
 	calc_load_update = jiffies + LOAD_FREQ;
 
 #ifdef CONFIG_SMP
-	zalloc_cpumask_var(&sched_domains_tmpmask, GFP_NOWAIT);
 	/* May be allocated at isolcpus cmdline parse time */
 	if (cpu_isolated_map == NULL)
 		zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 6dda2aab731e..6e1eae717a24 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -606,11 +606,9 @@ struct root_domain {
 
 extern struct root_domain def_root_domain;
 extern struct mutex sched_domains_mutex;
-extern cpumask_var_t fallback_doms;
-extern cpumask_var_t sched_domains_tmpmask;
 
 extern void init_defrootdomain(void);
-extern int init_sched_domains(const struct cpumask *cpu_map);
+extern int sched_init_domains(const struct cpumask *cpu_map);
 extern void rq_attach_root(struct rq *rq, struct root_domain *rd);
 
 #endif /* CONFIG_SMP */
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 09563c1d1d5b..a4b868c76f3c 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1526,7 +1526,7 @@ static struct sched_domain_attr		*dattr_cur;
  * cpumask) fails, then fallback to a single sched domain,
  * as determined by the single cpumask fallback_doms.
  */
-cpumask_var_t				fallback_doms;
+static cpumask_var_t			fallback_doms;
 
 /*
  * arch_update_cpu_topology lets virtualized architectures update the
@@ -1568,10 +1568,13 @@ void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms)
  * For now this just excludes isolated CPUs, but could be used to
  * exclude other special cases in the future.
  */
-int init_sched_domains(const struct cpumask *cpu_map)
+int sched_init_domains(const struct cpumask *cpu_map)
 {
 	int err;
 
+	zalloc_cpumask_var(&sched_domains_tmpmask, GFP_KERNEL);
+	zalloc_cpumask_var(&fallback_doms, GFP_KERNEL);
+
 	arch_update_cpu_topology();
 	ndoms_cur = 1;
 	doms_cur = alloc_sched_domains(ndoms_cur);