linux-kernel - Re: [PATCH] treewide: remove meaningless assignments in Makefiles

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Message-ID: <CAK7LNASch8P49gNagJ3OhMDqFNuzxcRRKatet2iedWFi76qoog@mail.gmail.com>
Date: Fri, 23 Feb 2024 11:25:05 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, linux-perf-users@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] treewide: remove meaningless assignments in Makefiles

On Fri, Feb 23, 2024 at 2:08 AM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hello,
>
> On Wed, Feb 21, 2024 at 5:42 AM Masahiro Yamada <masahiroy@...nelorg> wrote:
> >
> > In Makefiles, $(error ), $(warning ), and $(info ) expand to the empty
> > string, as explained in the GNU Make manual [1]:
> >  "The result of the expansion of this function is the empty string."
> >
> > Therefore, they are no-op except for logging purposes.
> >
> > $(shell ...) expands to the output of the command. It expands to the
> > empty string when the command does not print anything to stdout.
> > Hence, $(shell mkdir ...) is no-op except for creating the directory.
> >
> > Remove meaningless assignments.
> >
> > [1]: https://www.gnu.org/software/make/manual/make.html#Make-Control-Functions
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> > This is a treewide cleanup, but in practice, this is touching mostly
> > perf Makefiles. I am sending this to perf subsystem.
>
> How do you want to route this?  I can take it to perf tree if you're ok.


Yes, that is my expectation because it will reduce the risk
of merge conflicts.

I only included the perf maintainers and ML to To:,
and anything else in CC:




-- 
Best Regards
Masahiro Yamada