linux-kernel - Re: [PATCH] is_core_idle() is using a wrong variable

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Date:   Wed, 28 Jul 2021 12:41:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mika.penttila@...il.com
Cc:     linux-kernel@...r.kernel.org, lirongqing@...du.com,
        pbonzini@...hat.com, mingo@...hat.com, kvm@...r.kernel.org,
        Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] is_core_idle() is using a wrong variable

On Thu, Jul 22, 2021 at 09:39:46AM +0300, mika.penttila@...il.com wrote:
> From: Mika Penttilä <mika.penttila@...il.com>
> 
> is_core_idle() was using a wrong variable in the loop test. Fix it.
> 
> Signed-off-by: Mika Penttilä <mika.penttila@...il.com>

Thanks!

---
Subject: sched/numa: Fix is_core_idle()
From: Mika Penttilä <mika.penttila@...il.com>
Date: Thu, 22 Jul 2021 09:39:46 +0300

From: Mika Penttilä <mika.penttila@...il.com>

Use the loop variable instead of the function argument to test the
other SMT siblings for idle.

Fixes: ff7db0bf24db ("sched/numa: Prefer using an idle CPU as a migration target instead of comparing tasks")
Signed-off-by: Mika Penttilä <mika.penttila@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20210722063946.28951-1-mika.penttila@gmail.com
---
 kernel/sched/fair.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1486,7 +1486,7 @@ static inline bool is_core_idle(int cpu)
 		if (cpu == sibling)
 			continue;
 
-		if (!idle_cpu(cpu))
+		if (!idle_cpu(sibling))
 			return false;
 	}
 #endif