linux-kernel - Re: [PATCH v4 0/7] x86/boot: Remove runtime relocations from compressed kernel

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Date:   Tue, 14 Jul 2020 20:13:14 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Fangrui Song <maskray@...gle.com>,
        Dmitry Golovin <dima@...ovin.in>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "H . J . Lu" <hjl@...rceware.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/7] x86/boot: Remove runtime relocations from
 compressed kernel

On Tue, Jul 14, 2020 at 4:15 PM Arvind Sankar <nivedita@...m.mit.edu> wrote:
>
> On Tue, Jul 14, 2020 at 03:15:49PM +0200, Sedat Dilek wrote:
> >
> > How to test this series without building a full new kernel?
> >
> > make $make_opts vmlinux
> >
> > - Sedat -
> >
>
> Not sure I understood the question: you do have to build a full new
> kernel with this patch series to test it. Since the changes are to the
> compressed kernel, you would need to make bzImage, which is the end
> product of the full kernel build.
>
> Thanks.
>

Thanks for the informations.

make bzImage

...was the last I tried - gasped 15mins on this - after gasping 30mins on

make vmlinux

I did a full new build...

...and it fails with ld.lld-11 as linker:

ld.lld-11 -m elf_x86_64 -pie  --no-dynamic-linker -r -o
arch/x86/boot/compressed/.tmp_misc.o arch/x86/boot/compressed/misc.o
-T arch/x86/boot/compressed/.tmp_misc.ver; mv -f
arch/x86/boot/compressed/.tmp_misc.o arch/x86/boot/compressed/misc.o;
rm -f arch/x86/boot/compressed/.tmp_misc.ver; fi
*** ld.lld-11: error: -r and -pie may not be used together ***
make[5]: *** [scripts/Makefile.build:281:
arch/x86/boot/compressed/misc.o] Error 1

It's annoying to fail on the last minutes of a build.
Sorry for being very honest.

- Sedat -