linux-kernel - [tip:sched/core] sched/core: Pass child domain into sd

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Date:	Thu, 18 Aug 2016 03:57:25 -0700
From:	tip-bot for Morten Rasmussen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	morten.rasmussen@....com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, hpa@...or.com, tglx@...utronix.de,
	efault@....de, mingo@...nel.org, peterz@...radead.org
Subject: [tip:sched/core] sched/core: Pass child domain into sd_init()

Commit-ID:  3676b13e8524c576825fe1e731e347dba0083888
Gitweb:     http://git.kernel.org/tip/3676b13e8524c576825fe1e731e347dba0083888
Author:     Morten Rasmussen <morten.rasmussen@....com>
AuthorDate: Mon, 25 Jul 2016 14:34:23 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 18 Aug 2016 11:26:54 +0200

sched/core: Pass child domain into sd_init()

If behavioural sched_domain flags depend on topology flags set at higher
domain levels we need a way to update the child domain flags. Moving the
child pointer assignment inside sd_init() should make that possible.

Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: dietmar.eggemann@....com
Cc: freedom.tan@...iatek.com
Cc: keita.kobayashi.ym@...esas.com
Cc: mgalbraith@...e.de
Cc: sgurrappadi@...dia.com
Cc: vincent.guittot@...aro.org
Cc: yuyang.du@...el.com
Link: http://lkml.kernel.org/r/1469453670-2660-7-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 46bfb90..5739465 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6381,7 +6381,8 @@ static int sched_domains_curr_level;
 	 SD_SHARE_POWERDOMAIN)
 
 static struct sched_domain *
-sd_init(struct sched_domain_topology_level *tl, int cpu)
+sd_init(struct sched_domain_topology_level *tl,
+	struct sched_domain *child, int cpu)
 {
 	struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu);
 	int sd_weight, sd_flags = 0;
@@ -6433,6 +6434,7 @@ sd_init(struct sched_domain_topology_level *tl, int cpu)
 		.smt_gain		= 0,
 		.max_newidle_lb_cost	= 0,
 		.next_decay_max_lb_cost	= jiffies,
+		.child			= child,
 #ifdef CONFIG_SCHED_DEBUG
 		.name			= tl->name,
 #endif
@@ -6857,14 +6859,13 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
 		const struct cpumask *cpu_map, struct sched_domain_attr *attr,
 		struct sched_domain *child, int cpu)
 {
-	struct sched_domain *sd = sd_init(tl, cpu);
+	struct sched_domain *sd = sd_init(tl, child, cpu);
 
 	cpumask_and(sched_domain_span(sd), cpu_map, tl->mask(cpu));
 	if (child) {
 		sd->level = child->level + 1;
 		sched_domain_level_max = max(sched_domain_level_max, sd->level);
 		child->parent = sd;
-		sd->child = child;
 
 		if (!cpumask_subset(sched_domain_span(child),
 				    sched_domain_span(sd))) {