linux-kernel - Re: [PATCH] sched/core: Export pelt_thermal

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Message-ID: <YXrOLay3BbaDObM2@infradead.org>
Date:   Thu, 28 Oct 2021 09:22:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Qais Yousef <qais.yousef@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/core: Export pelt_thermal_tp

On Thu, Oct 28, 2021 at 06:18:55PM +0200, Peter Zijlstra wrote:
> > > @@ -36,6 +36,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_rt_tp);
> > >  EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_dl_tp);
> > >  EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_irq_tp);
> > >  EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_se_tp);
> > > +EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_thermal_tp);
> > >  EXPORT_TRACEPOINT_SYMBOL_GPL(sched_cpu_capacity_tp);
> > >  EXPORT_TRACEPOINT_SYMBOL_GPL(sched_overutilized_tp);
> > >  EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_cfs_tp);
> > 
> > ... and while we're at it, all these exports are unused and should
> > be deleted as well.
> 
> This is my concession wrt tracepoints. Actual tracepoints are ABI,
> exports are in-kernel interfaces and are explicitly not ABI.
> 
> This way people can use an external module to get at the tracepoint data
> without having in-tree tracepoints.

All of this makes no sense at all.  These are entirely dead exports.
If you remove them nothing else changes.  Note taht the tracepoints
do have in-kernel callers, so if people thing of them as an ABI you've
got your ABI already with or without the exports.