linux-kernel - Re: localmodconfig - "intel_rapl

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Message-ID: <55b09be8-5bb2-60e3-8386-05bc9f6fd854@infradead.org>
Date:   Tue, 25 Aug 2020 14:12:16 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Nathan Royce <nroycea+kernel@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Changbin Du <changbin.du@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: localmodconfig - "intel_rapl_perf config not found!!"

> On Tue, Aug 25, 2020 at 2:13 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> so intel_rapl_perf is listed in your lsmod.cfg file:
>> intel_rapl_perf        16384  2
>>
>> You say Linux 5.8.3.  I'm guessing that your "make localmodconfig" tree
>> is Linux 5.8.3 (?).  What kernel version are you running?
>> I think that it's older, and some file/module names have changed since then.

On 8/25/20 1:34 PM, Nathan Royce wrote:
> Correct. I'm building for 5.8.3 and I'm currently on 5.7.4 (1 month
> doesn't seem particularly old).

Yes, things can change quickly.

I don't see any support in streamline_config.pl for Kconfig symbols
and/or modules whose names have changed.  Trying to do something
like that would be a never-ending job (a la job security).

At least it gave you a warning that it couldn't find a Kconfig symbol
for that module.

>From your original email:
| I'm going to assume it has something to do with the naming and it's
| supposed to be associated with "Intel/AMD rapl performance events
| (CONFIG_PERF_EVENTS_INTEL_RAPL)" which I already have set to 'Y'.

Yes, commit fd3ae1e1587d64ef8cc8e361903d33625458073e changed the module name
since it now supports both Intel and AMD.

| Right below that, I also get 'Use of uninitialized value
| $ENV{"LMC_KEEP"} in split at ./scripts/kconfig/streamline_config.pl
| line 596.', but again that is the sort of thing that may warrant a new
| email specific to localmodconfig author(s). But again maybe not
| because I take it more as a warning given I don't make use of
| LMC_KEEP.

@Changbin: can you fix this little bug in streamline_config.pl, please? ^^^^^

-- 
~Randy