linux-kernel - Re: [PATCH v2 05/13] kbuild: detect objtool update without using .SECONDEXPANSION

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Date:   Fri, 3 Sep 2021 08:42:39 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 05/13] kbuild: detect objtool update without using .SECONDEXPANSION

On Wed, Sep 1, 2021 at 2:33 AM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> On Tue, Aug 31, 2021 at 12:40 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > Redo commit 8852c5524029 ("kbuild: Fix objtool dependency for
> > 'OBJECT_FILES_NON_STANDARD_<obj> := n'") to add the objtool
> > dependency in a cleaner way.
> >
> > Using .SECONDEXPANSION ends up with unreadable code due to escaped
> > dollars. Also, it is not efficient because the second half of
> > Makefile.build is parsed twice every time.
> >
> > Append the objtool dependency to the *.cmd files at the build time.
> >
> > This is what fixdep and gen_ksymdeps.sh already do. So, following the
> > same pattern seems a natural solution.
> >
> > This allows us to drop $$(objtool_deps) entirely.
>
> s/objtool_deps/objtool_dep/
>
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
>
> You and Josh should be cc'ing each other explicitly on these kind of changes.
>


FWIW, this is the entire patch set if Josh is interested:

https://patchwork.kernel.org/project/linux-kbuild/list/?series=539621


--
Best Regards
Masahiro Yamada