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From: Masahiro Yamada <masahiroy@kernel.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v2 05/13] kbuild: detect objtool update without using .SECONDEXPANSION
Date: Fri, 3 Sep 2021 08:42:39 +0900	[thread overview]
Message-ID: <CAK7LNAQeYJJuKTsYxyXV-_7bKfwWgS+Pa8FTadg_p-XHb0NPLg@mail.gmail.com> (raw)
In-Reply-To: <CAKwvOdmsnuv6qa5USKqqhg419FGD55U2zGw_KngmBcz_UDOOcg@mail.gmail.com>

On Wed, Sep 1, 2021 at 2:33 AM Nick Desaulniers <ndesaulniers@google.com> wrote:
>
> On Tue, Aug 31, 2021 at 12:40 AM Masahiro Yamada <masahiroy@kernel.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@kernel.org>
>
> Reviewed-by: Nick Desaulniers <ndesaulniers@google.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

  reply	other threads:[~2021-09-02 23:43 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31  7:39 [PATCH v2 00/13] kbuild: second round of Clang LTO refactoring Masahiro Yamada
2021-08-31  7:39 ` [PATCH v2 01/13] kbuild: move objtool_args back to scripts/Makefile.build Masahiro Yamada
2021-09-04 18:18   ` Josh Poimboeuf
2021-08-31  7:39 ` [PATCH v2 02/13] kbuild: rename __objtool_obj to objtool Masahiro Yamada
2021-08-31 17:16   ` Nick Desaulniers
2021-08-31 17:29   ` Kees Cook
2021-09-04 18:19   ` Josh Poimboeuf
2021-08-31  7:39 ` [PATCH v2 03/13] kbuild: store the objtool command in *.cmd files Masahiro Yamada
2021-08-31 17:23   ` Nick Desaulniers
2021-08-31 17:30   ` Kees Cook
2021-09-04 18:04   ` Josh Poimboeuf
2021-09-04 18:45     ` Josh Poimboeuf
2021-09-08 16:12       ` Masahiro Yamada
2021-08-31  7:39 ` [PATCH v2 04/13] kbuild: factor out OBJECT_FILES_NON_STANDARD check into a macro Masahiro Yamada
2021-08-31 17:25   ` Nick Desaulniers
2021-08-31 17:31   ` Kees Cook
2021-09-04 18:59   ` Josh Poimboeuf
2021-08-31  7:39 ` [PATCH v2 05/13] kbuild: detect objtool update without using .SECONDEXPANSION Masahiro Yamada
2021-08-31 17:32   ` Kees Cook
2021-09-03  0:43     ` Masahiro Yamada
2021-08-31 17:33   ` Nick Desaulniers
2021-09-02 23:42     ` Masahiro Yamada [this message]
2021-09-04 19:04   ` Josh Poimboeuf
2021-08-31  7:39 ` [PATCH v2 06/13] kbuild: reuse $(cmd_objtool) for cmd_cc_lto_link_modules Masahiro Yamada
2021-08-31 17:35   ` Kees Cook
2021-09-03  0:39     ` Masahiro Yamada
2021-09-03  1:49       ` Kees Cook
2021-09-04 19:11   ` Josh Poimboeuf
2021-08-31  7:39 ` [PATCH v2 07/13] kbuild: do not create built-in.a.symversions or lib.a.symversions Masahiro Yamada
2021-08-31 17:36   ` Kees Cook
2021-08-31  7:39 ` [PATCH v2 08/13] kbuild: build modules in the same way with/without Clang LTO Masahiro Yamada
2021-08-31 17:39   ` Kees Cook
2021-08-31 17:46   ` Nick Desaulniers
2021-08-31  7:40 ` [PATCH v2 09/13] kbuild: add cmd_and_savecmd macro Masahiro Yamada
2021-08-31 17:39   ` Kees Cook
2021-08-31  7:40 ` [PATCH v2 10/13] kbuild: rebuild modules when objtool is updated for CONFIG_LTO_CLANG Masahiro Yamada
2021-08-31 17:40   ` Kees Cook
2021-09-04 19:13   ` Josh Poimboeuf
2021-08-31  7:40 ` [PATCH v2 11/13] kbuild: always postpone CRC links for module versioning Masahiro Yamada
2021-08-31  7:40 ` [PATCH v2 12/13] kbuild: merge cmd_modversions_c and cmd_modversions_S Masahiro Yamada
2021-08-31  7:40 ` [PATCH v2 13/13] kbuild: merge cmd_ar_builtin and cmd_ar_module Masahiro Yamada

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