linux-kernel - [PATCH v2] sched: sched_domain fix highest_flag

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Date:   Tue, 27 Oct 2020 11:32:52 +0800
From:   Xuewen Yan <xuewen.yan94@...il.com>
To:     xuewen.yan@...soc.com, mingo@...hat.com, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org
Cc:     dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, linux-kernel@...r.kernel.org,
        Xuewen Yan <xuewen.yan94@...il.com>
Subject: [PATCH v2] sched: sched_domain fix highest_flag_domain function

the highest_flag_domain is to search the highest sched_domain
containing flag, but if the lower sched_domain didn't contain
the flag, but the higher sched_domain contains the flag, the
function will return NULL instead of the higher sched_domain.

For example:
In MC domain : no SD_ASYM_CPUCAPACITY flag;
In DIE domain : containing SD_ASYM_CPUCAPACITY flag;
the "highest_flag_domain(cpu, SD_ASYM_CPUCAPACITY)" will return NULL.

Signed-off-by: Xuewen Yan <xuewen.yan94@...il.com>
---
 kernel/sched/sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 28709f6..2c7c566 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1427,7 +1427,7 @@ static inline struct sched_domain *highest_flag_domain(int cpu, int flag)

 	for_each_domain(cpu, sd) {
 		if (!(sd->flags & flag))
-			break;
+			continue;
 		hsd = sd;
 	}

-- 
1.9.1