linux-kernel - [RFC 30/60] cosched: Disallow share modification on task groups for now

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Date:   Fri,  7 Sep 2018 23:40:17 +0200
From:   Jan H. Schönherr <jschoenh@...zon.de>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jan H. Schönherr <jschoenh@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [RFC 30/60] cosched: Disallow share modification on task groups for now

The code path is not yet adjusted for coscheduling. Disable
it for now.

Signed-off-by: Jan H. Schönherr <jschoenh@...zon.de>
---
 kernel/sched/fair.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 30e5ff30f442..8504790944bf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9942,6 +9942,15 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
 {
 	int i;
 
+#ifdef CONFIG_COSCHEDULING
+	/*
+	 * FIXME: This function has not been adjusted for coscheduling.
+	 *        Disable it completely for now.
+	 */
+	WARN_ON_ONCE(1);
+	return -EINVAL;
+#endif
+
 	/*
 	 * We can't change the weight of the root cgroup.
 	 */
@@ -9955,6 +9964,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
 		goto done;
 
 	tg->shares = shares;
+
 	for_each_possible_cpu(i) {
 		struct rq *rq = cpu_rq(i);
 		struct sched_entity *se = tg->cfs_rq[i]->my_se;
-- 
2.9.3.1.gcba166c.dirty