linux-kernel - Re: [PATCH v2 03/13] kbuild: store the objtool command in *.cmd files

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Message-ID: <CAK7LNAT64yiN2GG2R9hQXg8wPzL4D4WgWikLNxcp_TYzZ3ijqg@mail.gmail.com>
Date:   Thu, 9 Sep 2021 01:12:45 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/13] kbuild: store the objtool command in *.cmd files

On Sun, Sep 5, 2021 at 3:45 AM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
>
> On Sat, Sep 04, 2021 at 11:04:37AM -0700, Josh Poimboeuf wrote:
> > On Tue, Aug 31, 2021 at 04:39:54PM +0900, Masahiro Yamada wrote:
> > > objtool_dep includes include/config/{ORC_UNWINDER,STACK_VALIDATION}
> > > so that all the objects are rebuilt when any of CONFIG_ORC_UNWINDER
> > > and CONFIG_STACK_VALIDATION is toggled.
> > >
> > > As you can see in 'objtool_args', there are more CONFIG options
> > > that affect the objtool command line.
> > >
> > > Adding more and more include/config/* is ugly and unmaintainable.
> > >
> > > Another issue is that non-standard objects are needlessly rebuilt.
> > > Objects specified as OBJECT_FILES_NON_STANDARD is not processed by
> > > objtool, but they are rebuilt anyway when CONFIG_ORC_UNWINDER or
> > > CONFIG_STACK_VALIDATION is toggled. This is not a big deal, but
> > > better to fix.
> > >
> > > A cleaner and more precise fix is to include the objtool command in
> > > *.cmd files so any command change is naturally detected by if_change.
> >
> > Nice improvement, thanks!
> >
> > s/CONFIG_ORC_UNWINDER/CONFIG_UNWINDER_ORC/g
> >
> > And yes, this means the original ORC unwinder dependency didn't
> > work:
> >
> > > -objtool_dep = $(objtool_obj)                                       \
> > > -         $(wildcard include/config/ORC_UNWINDER            \
> > > -                    include/config/STACK_VALIDATION)
>
> With the typos fixed, and this dependency bug mentioned in the commit
> log:


Ah, nice catch.



commit 11af847446ed0d131cf24d16a7ef3d5ea7a49554
missed to adjust the dependency part.

I will update the commit log
and mention this breakage.







> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
>
> --
> Josh
>


-- 
Best Regards
Masahiro Yamada