linux-kernel - Re: [PATCH v2 2/3] sched: make migrate_enable/migrate

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Message-ID: <20250819124525.GF4068168@noisy.programming.kicks-ass.net>
Date: Tue, 19 Aug 2025 14:45:25 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, ast@...nel.org,
	daniel@...earbox.net, john.fastabend@...il.com, andrii@...nel.org,
	martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
	yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...ichev.me,
	haoluo@...gle.com, jolsa@...nel.org, simona.vetter@...ll.ch,
	tzimmermann@...e.de, jani.nikula@...el.com,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2 2/3] sched: make migrate_enable/migrate_disable inline

On Tue, Aug 19, 2025 at 02:32:14PM +0200, Peter Zijlstra wrote:
> On Tue, Aug 19, 2025 at 09:58:31AM +0800, Menglong Dong wrote:
> 
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index be00629f0ba4..00383fed9f63 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -119,6 +119,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
> >  EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
> >  
> >  DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
> > +EXPORT_SYMBOL_GPL(runqueues);
> 
> Oh no, absolutely not.
> 
> You never, ever, export a variable, and certainly not this one.
> 
> How about something like so?
> 
> I tried 'clever' things with export inline, but the compiler hates me,
> so the below is the best I could make work.

extern inline, that is, obviously...