linux-kernel - [tip: sched/urgent] sched/core: Fix comparison in sched_group_cookie

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Message-ID: <166601794728.401.12715574315291898146.tip-bot2@tip-bot2>
Date:   Mon, 17 Oct 2022 14:45:47 -0000
From:   "tip-bot2 for Lin Shengwang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Lin Shengwang <linshengwang1@...wei.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/urgent] sched/core: Fix comparison in sched_group_cookie_match()

The following commit has been merged into the sched/urgent branch of tip:

Commit-ID:     e705968dd687574b6ca3ebe772683d5642759132
Gitweb:        https://git.kernel.org/tip/e705968dd687574b6ca3ebe772683d5642759132
Author:        Lin Shengwang <linshengwang1@...wei.com>
AuthorDate:    Sat, 08 Oct 2022 10:27:09 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 17 Oct 2022 16:41:24 +02:00

sched/core: Fix comparison in sched_group_cookie_match()

In commit 97886d9dcd86 ("sched: Migration changes for core scheduling"),
sched_group_cookie_match() was added to help determine if a cookie
matches the core state.

However, while it iterates the SMT group, it fails to actually use the
RQ for each of the CPUs iterated, use cpu_rq(cpu) instead of rq to fix
things.

Fixes: 97886d9dcd86 ("sched: Migration changes for core scheduling")
Signed-off-by: Lin Shengwang <linshengwang1@...wei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20221008022709.642-1-linshengwang1@huawei.com
---
 kernel/sched/sched.h | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 1644242..0d08511 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1182,6 +1182,14 @@ static inline bool is_migration_disabled(struct task_struct *p)
 #endif
 }
 
+DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
+
+#define cpu_rq(cpu)		(&per_cpu(runqueues, (cpu)))
+#define this_rq()		this_cpu_ptr(&runqueues)
+#define task_rq(p)		cpu_rq(task_cpu(p))
+#define cpu_curr(cpu)		(cpu_rq(cpu)->curr)
+#define raw_rq()		raw_cpu_ptr(&runqueues)
+
 struct sched_group;
 #ifdef CONFIG_SCHED_CORE
 static inline struct cpumask *sched_group_span(struct sched_group *sg);
@@ -1269,7 +1277,7 @@ static inline bool sched_group_cookie_match(struct rq *rq,
 		return true;
 
 	for_each_cpu_and(cpu, sched_group_span(group), p->cpus_ptr) {
-		if (sched_core_cookie_match(rq, p))
+		if (sched_core_cookie_match(cpu_rq(cpu), p))
 			return true;
 	}
 	return false;
@@ -1384,14 +1392,6 @@ static inline void update_idle_core(struct rq *rq)
 static inline void update_idle_core(struct rq *rq) { }
 #endif
 
-DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
-
-#define cpu_rq(cpu)		(&per_cpu(runqueues, (cpu)))
-#define this_rq()		this_cpu_ptr(&runqueues)
-#define task_rq(p)		cpu_rq(task_cpu(p))
-#define cpu_curr(cpu)		(cpu_rq(cpu)->curr)
-#define raw_rq()		raw_cpu_ptr(&runqueues)
-
 #ifdef CONFIG_FAIR_GROUP_SCHED
 static inline struct task_struct *task_of(struct sched_entity *se)
 {