linux-kernel - Re: [PATCH v2 0/4] x86/boot: Remove runtime relocations from compressed kernel

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Date:   Wed, 27 May 2020 08:24:26 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <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>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] x86/boot: Remove runtime relocations from
 compressed kernel

On Tue, May 26, 2020 at 5:31 PM Arvind Sankar <nivedita@...m.mit.edu> wrote:
>
> On Tue, May 26, 2020 at 05:07:24PM +0200, Sedat Dilek wrote:
> > > >
> > >
> > > Maybe this should be:
> > >
> > > [ arch/x86/boot/compressed/Makefile ]
> > >
> > > -KBUILD_CFLAGS += -include hidden.h
> > > +KBUILD_CFLAGS += -include ./hidden.h
> > >
> >
> > NOPE.
> >
> > This works:
> >
> > [ arch/x86/boot/compressed/Makefile ]
> >
> > -KBUILD_CFLAGS += -include hidden.h
> > +KBUILD_CFLAGS += -include ./arch/x86/boot/compressed/hidden.h
> >
> > $ ll arch/x86/boot/bzImage arch/x86/boot/compressed/vmlinux
> > -rw-r--r-- 1 dileks dileks 6,5M Mai 26 17:05 arch/x86/boot/bzImage
> > -rwxr-xr-x 1 dileks dileks 6,5M Mai 26 17:05 arch/x86/boot/compressed/vmlinux
> >
> > - Sedat -
>
> It needs to either be $(srctree)/$(src)/hidden.h, or we should add
> -I $(srctree)/$(src) to the KBUILD_CFLAGS. The latter option is added
> automatically when building in a separate builddir with O=${KOBJ} (which
> is how I, and I assume Ard, was testing), but for some reason is not
> added when building in-tree. The -include option doesn't automatically
> search the directory of the source file.
>
> -include file Process file as if "#include "file"" appeared as the first
> line of the primary source file.  However, the first directory searched
> for file is the preprocessor's working directory instead of the
> directory containing the main source file.  If not found there, it is
> searched for in the remainder of the "#include "..."" search chain as
> normal.

Will you send a follow-up or a v3 for this?

- Sedat -