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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK7LNAQeYJJuKTsYxyXV-_7bKfwWgS+Pa8FTadg_p-XHb0NPLg@mail.gmail.com>
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