linux-kernel - Re: [PATCH] sched/fair: Fix kernel build warning in test_idle

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Date:   Thu, 27 Feb 2020 12:08:46 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, mgorman@...hsingularity.net
Subject: Re: [PATCH] sched/fair: Fix kernel build warning in test_idle_cores()
 for !SMT NUMA

Hi Valentin,

On 2/27/20 11:04 AM, Valentin Schneider wrote:
> Hi Lukasz,
> 
> On 2/27/20 11:00 AM, Lukasz Luba wrote:
>> Fix kernel build warning in kernel/sched/fair.c when CONFIG_SCHED_SMT is
>> not set and CONFIG_NUMA_BALANCING is set.
>>
>> kernel/sched/fair.c:1524:20: warning: ‘test_idle_cores’ declared ‘static’ but never defined [-Wunused-function]
>>
> 
> I've sent a similar fix yesterday at:
> 
> https://lore.kernel.org/lkml/20200226121244.7524-1-valentin.schneider@arm.com/
> 

I've missed it. You are referring in the commit message to wrong change
(probably HEAD of that branch), while when you try to bisect, it
will point you to
ff7db0bf24db sched/numa: Prefer using an idle CPU as a migration target 
instead of comparing tasks

I think Mel can simply resend the patches with correct build if Ingo
is OK.

If Mel would decide to go with extended approach of ifdefs, then maybe
it's also good to put in there  numa_idle_core(), which actually uses
these test_idle_cores() and is_core_idle()

Regards,
Lukasz