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

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Message-ID: <20200714201451.GA902932@rani.riverdale.lan>
Date:   Tue, 14 Jul 2020 16:14:51 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        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 10:10:14PM +0200, Sedat Dilek wrote:
> On Tue, Jul 14, 2020 at 10:07 PM Arvind Sankar <nivedita@...m.mit.edu> wrote:
> >
> > On Tue, Jul 14, 2020 at 09:53:19PM +0200, Sedat Dilek wrote:
> > >
> > > Hmm, you might be right with moving to LDFLAGS_vmlinux.
> > >
> > > Attached are my linux-config and dmesg-output.
> > >
> > > - Sedat -
> >
> > Which tree are you building against? I notice you have KERNEL_ZSTD
> > enabled, which hasn't been merged yet.
> >
> > Are you using Nick's series [v7]?
> >
> > Also from the naming -- are you using LLVM_IAS=1 with some patches to
> > make it work?
> >
> > [v7] https://lore.kernel.org/lkml/20200708185024.2767937-1-nickrterrell@gmail.com/
> 
> Sorry for not telling you the full story.
> Yes, I have some additional patches like Nick T. "zstd-v7" which
> should IMHO not touch this area.
> 
> - Sedat -

That series does touch boot/compressed, since the point is to add
support for zstd-compressed kernels. I'll need to test it out, the
__DISABLE_EXPORTS he's now using must not be working for some reason.