linux-kernel - Re: localmodconfig - "intel_rapl

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Date:   Wed, 26 Aug 2020 17:10:05 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Nathan Royce <nroycea+kernel@...il.com>,
        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@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: localmodconfig - "intel_rapl_perf config not found!!"

On Tue, 25 Aug 2020 14:34:34 -0700
Randy Dunlap <rdunlap@...radead.org> wrote:

> On 8/25/20 2:12 PM, Randy Dunlap wrote:
> >> 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.

Yes and as Randy said, there's no way to easily fix that.

> > 
> > 
> > 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.

Correct, this is exactly why I have it warn. Because this happens all
the time. In most cases, I simply ignore the warning ;-)


> > 
> > 
> > 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? ^^^^^  
> 
> Changing email address for Changbin.
> Plus I made the quick patch for streamline_config.pl (below)
> although I haven't tested it.
> 
> ---
> From: Randy Dunlap <rdunlap@...radead.org>
> 
> A user reported:
> 'Use of uninitialized value $ENV{"LMC_KEEP"} in split at
>  ./scripts/kconfig/streamline_config.pl line 596.'
> 
> so first check that $ENV{LMC_KEEP} is defined before trying
> to use it.

Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Randy, please send this as a stand alone patch to the KBUILD
maintainers.

-- Steve


> 
> Fixes: c027b02d89fd ("streamline_config.pl: add LMC_KEEP to preserve some kconfigs")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Changbin Du <changbin.du@...il.com>
> Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> ---
>  scripts/kconfig/streamline_config.pl |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> --- linux-next-20200825.orig/scripts/kconfig/streamline_config.pl
> +++ linux-next-20200825/scripts/kconfig/streamline_config.pl
> @@ -593,7 +593,10 @@ while ($repeat) {
>  }
>  
>  my %setconfigs;
> -my @preserved_kconfigs = split(/:/,$ENV{LMC_KEEP});
> +my @preserved_kconfigs;
> +if (defined($ENV{'LMC_KEEP'})) {
> +	@preserved_kconfigs = split(/:/,$ENV{LMC_KEEP});
> +}
>  
>  sub in_preserved_kconfigs {
>      my $kconfig = $config2kfile{$_[0]};