linux-kernel - Re: [PATCH 2/2] x86, sched: Fix the undefined reference building error of init_freq_invariance

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Message-ID: <YdcWy0wSKSO3nzbU@zn.tnic>
Date:   Thu, 6 Jan 2022 17:23:01 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Huang Rui <ray.huang@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Yuan, Perry" <Perry.Yuan@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        kernel test robot <lkp@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86, sched: Fix the undefined reference building
 error of init_freq_invariance_cppc

On Thu, Jan 06, 2022 at 05:12:51PM +0100, Rafael J. Wysocki wrote:
> And why can't it be a real use case?

You mean there's someone out there running SMP=n kernels on current
hardware which has CPPC too? Yeah, right.

> The honest answer is that we don't know.
>
> Moreover, AFAICS the requisite #ifdeffery is there already and  the
> problem is that the init_freq_invariance_cppc() defined in smpboot.c
> is not exported to modules and the CPPC code is modular in this build.

Yah, I saw that. And that's why I'm saying CPPC should depend on SMP -
because it needs that functionality which is defined there.

But if you really wanna support SMP=n, I don't care that much to debate
this more - I just think it is silly.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette