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Date: Fri, 23 Feb 2024 16:11:45 -0800
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Subject: [RESEND][PATCH v8 5/7] sched: Consolidate pick_*_task to
 task_is_pushable helper
From: John Stultz <jstultz@google.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: "Connor O'Brien" <connoro@google.com>, Joel Fernandes <joelaf@google.com>, 
	Qais Yousef <qyousef@google.com>, Ingo Molnar <mingo@redhat.com>, 
	Peter Zijlstra <peterz@infradead.org>, Juri Lelli <juri.lelli@redhat.com>, 
	Vincent Guittot <vincent.guittot@linaro.org>, Dietmar Eggemann <dietmar.eggemann@arm.com>, 
	Valentin Schneider <vschneid@redhat.com>, Steven Rostedt <rostedt@goodmis.org>, 
	Ben Segall <bsegall@google.com>, Zimuzo Ezeozue <zezeozue@google.com>, 
	Youssef Esmat <youssefesmat@google.com>, Mel Gorman <mgorman@suse.de>, 
	Daniel Bristot de Oliveira <bristot@redhat.com>, Will Deacon <will@kernel.org>, Waiman Long <longman@redhat.com>, 
	Boqun Feng <boqun.feng@gmail.com>, "Paul E. McKenney" <paulmck@kernel.org>, 
	Metin Kaya <Metin.Kaya@arm.com>, Xuewen Yan <xuewen.yan94@gmail.com>, 
	K Prateek Nayak <kprateek.nayak@amd.com>, Thomas Gleixner <tglx@linutronix.de>, kernel-team@android.com, 
	John Stultz <jstultz@google.com>
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From: Connor O'Brien <connoro@google.com>

This patch consolidates rt and deadline pick_*_task functions to
a task_is_pushable() helper

This patch was broken out from a larger chain migration
patch originally by Connor O'Brien.

Cc: Joel Fernandes <joelaf@google.com>
Cc: Qais Yousef <qyousef@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Zimuzo Ezeozue <zezeozue@google.com>
Cc: Youssef Esmat <youssefesmat@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Metin Kaya <Metin.Kaya@arm.com>
Cc: Xuewen Yan <xuewen.yan94@gmail.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-team@android.com
Signed-off-by: Connor O'Brien <connoro@google.com>
[jstultz: split out from larger chain migration patch,
 renamed helper function]
Signed-off-by: John Stultz <jstultz@google.com>
---
v7:
* Split from chain migration patch
* Renamed function
---
 kernel/sched/deadline.c | 10 +---------
 kernel/sched/rt.c       | 11 +----------
 kernel/sched/sched.h    | 10 ++++++++++
 3 files changed, 12 insertions(+), 19 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index e68d88963e89..1b9cdb507498 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2179,14 +2179,6 @@ static void task_fork_dl(struct task_struct *p)
 /* Only try algorithms three times */
 #define DL_MAX_TRIES 3
 
-static int pick_dl_task(struct rq *rq, struct task_struct *p, int cpu)
-{
-	if (!task_on_cpu(rq, p) &&
-	    cpumask_test_cpu(cpu, &p->cpus_mask))
-		return 1;
-	return 0;
-}
-
 /*
  * Return the earliest pushable rq's task, which is suitable to be executed
  * on the CPU, NULL otherwise:
@@ -2205,7 +2197,7 @@ static struct task_struct *pick_earliest_pushable_dl_task(struct rq *rq, int cpu
 	if (next_node) {
 		p = __node_2_pdl(next_node);
 
-		if (pick_dl_task(rq, p, cpu))
+		if (task_is_pushable(rq, p, cpu) == 1)
 			return p;
 
 		next_node = rb_next(next_node);
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index dd072d11cc02..638e7c158ae4 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1791,15 +1791,6 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 /* Only try algorithms three times */
 #define RT_MAX_TRIES 3
 
-static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
-{
-	if (!task_on_cpu(rq, p) &&
-	    cpumask_test_cpu(cpu, &p->cpus_mask))
-		return 1;
-
-	return 0;
-}
-
 /*
  * Return the highest pushable rq's task, which is suitable to be executed
  * on the CPU, NULL otherwise
@@ -1813,7 +1804,7 @@ static struct task_struct *pick_highest_pushable_task(struct rq *rq, int cpu)
 		return NULL;
 
 	plist_for_each_entry(p, head, pushable_tasks) {
-		if (pick_rt_task(rq, p, cpu))
+		if (task_is_pushable(rq, p, cpu) == 1)
 			return p;
 	}
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 6ca83837e0f4..c83e5e0672dc 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -3480,6 +3480,16 @@ void do_push_task(struct rq *rq, struct rq *dst_rq, struct task_struct *task)
 	set_task_cpu(task, dst_rq->cpu);
 	activate_task(dst_rq, task, 0);
 }
+
+static inline
+int task_is_pushable(struct rq *rq, struct task_struct *p, int cpu)
+{
+	if (!task_on_cpu(rq, p) &&
+	    cpumask_test_cpu(cpu, &p->cpus_mask))
+		return 1;
+
+	return 0;
+}
 #endif
 
 #endif /* _KERNEL_SCHED_SCHED_H */
-- 
2.44.0.rc0.258.g7320e95886-goog