linux-kernel - [PATCH] sched/core: Fix prio for fair in __task

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Date: Mon, 29 Jan 2024 18:06:33 +0800
From: Wang Jinchao <wangjinchao@...sion.com>
To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot
	<vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel
 Gorman <mgorman@...e.de>, Daniel Bristot de Oliveira <bristot@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>, <linux-kernel@...r.kernel.org>
CC: <stone.xulei@...sion.com>, <wangjinchao@...sion.com>
Subject: [PATCH] sched/core: Fix prio for fair in __task_prio

It is said "120" in the comment, but MAX_RT_PRIO + MAX_NICE equals 119.
DEFAULT_PRIO should be the right prio.
Fix it and imodify the corresponding prio in prio_less.

Signed-off-by: Wang Jinchao <wangjinchao@...sion.com>
---
 kernel/sched/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9116bcc90346..13484ee71e5b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -168,7 +168,7 @@ static inline int __task_prio(const struct task_struct *p)
 	if (p->sched_class == &idle_sched_class)
 		return MAX_RT_PRIO + NICE_WIDTH; /* 140 */
 
-	return MAX_RT_PRIO + MAX_NICE; /* 120, squash fair */
+	return DEFAULT_PRIO; /* 120, squash fair */
 }
 
 /*
@@ -194,7 +194,7 @@ static inline bool prio_less(const struct task_struct *a,
 	if (pa == -1) /* dl_prio() doesn't work because of stop_class above */
 		return !dl_time_before(a->dl.deadline, b->dl.deadline);
 
-	if (pa == MAX_RT_PRIO + MAX_NICE)	/* fair */
+	if (pa == DEFAULT_PRIO)	/* fair */
 		return cfs_prio_less(a, b, in_fi);
 
 	return false;
-- 
2.40.0