linux-kernel - Re: [PATCH v7 1/8] kbuild: replace $(linked-object) with CONFIG options

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Date:   Sat, 28 May 2022 04:32:19 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, llvm@...ts.linux.dev,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v7 1/8] kbuild: replace $(linked-object) with CONFIG options

On Fri, May 27, 2022 at 1:56 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> *.prelink.o is created when CONFIG_LTO_CLANG or CONFIG_X86_KERNEL_IBT
> is enabled.
>
> Replace $(linked-object) with $(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT)
> so you will get better idea when the --link option is passed.
>
> No functional change is intended.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Hi Masahiroy,

I was not CCed on the cover-letter and only on some patches in this series.

So, I have re-tested this series by pulling from kbuild.git#kbuild
(saw later you renewed the parisc/nm patch).

While testing my selfmade LLVM version 14.0.4 (PGO + ThinLTO
optimized) toolchain I included this series.

Just built fine and I was able to boot on bare metal.

-Sedat -

> ---
>
> Changes in v7:
>   - New patch
>
>  scripts/Makefile.build | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 06400504150b..f80196eef03a 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -219,7 +219,7 @@ objtool_args =                                                              \
>         $(if $(CONFIG_STACK_VALIDATION), --stackval)                    \
>         $(if $(CONFIG_HAVE_STATIC_CALL_INLINE), --static-call)          \
>         --uaccess                                                       \
> -       $(if $(linked-object), --link)                                  \
> +       $(if $($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT)), --link)    \
>         $(if $(part-of-module), --module)                               \
>         $(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
>
> @@ -284,7 +284,6 @@ quiet_cmd_cc_prelink_modules = LD [M]  $@
>  # modules into native code
>  $(obj)/%.prelink.o: objtool-enabled = y
>  $(obj)/%.prelink.o: part-of-module := y
> -$(obj)/%.prelink.o: linked-object := y
>
>  $(obj)/%.prelink.o: $(obj)/%.o FORCE
>         $(call if_changed,cc_prelink_modules)
> --
> 2.32.0
>