linux-kernel - Re: [PATCH v4 00/14] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL

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Date:   Mon, 9 May 2022 15:13:28 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-modules <linux-modules@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH v4 00/14] kbuild: yet another series of cleanups
 (modpost, LTO, MODULE_REL_CRCS, export.h)

On Mon, May 09, 2022 at 01:24:33PM +0900, Masahiro Yamada wrote:
> On Mon, May 9, 2022 at 4:09 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > This is the third batch of cleanups in this development cycle.
> >
> > Major changes in v4:
> >  - Move static EXPORT_SYMBOL check to a script
> >  - Some refactoring
> >
> > Major changes in v3:
> >
> >  - Generate symbol CRCs as C code, and remove CONFIG_MODULE_REL_CRCS.
> >
> > Major changes in v2:
> >
> >  - V1 did not work with CONFIG_MODULE_REL_CRCS.
> >    I fixed this for v2.
> >
> >  - Reflect some review comments in v1
> >
> >  - Refactor the code more
> >
> >  - Avoid too long argument error
> 
> This series is available at
> git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
> lto-cleanup-v4

Hi Masahiro,

I checked this out and went to run it through my QEMU tests but I see
two new errors.

Failure #1:

In file included from scripts/mod/section-check.c:3:
scripts/mod/modpost.h:15:10: fatal error: 'elfconfig.h' file not found
#include "elfconfig.h"
         ^~~~~~~~~~~~~
1 error generated.

I was able to get past that with

diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
index ca739c6c68a1..c33b83bfbcad 100644
--- a/scripts/mod/Makefile
+++ b/scripts/mod/Makefile
@@ -16,7 +16,7 @@ targets += $(devicetable-offsets-file) devicetable-offsets.s

 # dependencies on generated files need to be listed explicitly

-$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o: $(obj)/elfconfig.h
+$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o $(obj)/section-check.o: $(obj)/elfconfig.h
 $(obj)/file2alias.o: $(obj)/$(devicetable-offsets-file)

 quiet_cmd_elfconfig = MKELF   $@

Failure #2:

  GEN     .version
  CHK     include/generated/compile.h
  GEN     .tmp_initcalls.lds
  LTO     vmlinux.o
  OBJTOOL vmlinux.o
  MODPOST vmlinux.symvers
  MODINFO modules.builtin.modinfo
  GEN     modules.builtin
  LD      .tmp_vmlinux.btf
ld.lld: error: cannot open .vmlinux.export.o: No such file or directory
  BTF     .btf.vmlinux.bin.o
pahole: .tmp_vmlinux.btf: No such file or directory
  CC      .vmlinux.export.c
  LD      .tmp_vmlinux.kallsyms1
ld.lld: error: .btf.vmlinux.bin.o: unknown file type
make[1]: *** [Makefile:1159: vmlinux] Error 1

I was not really able to see what is going wrong here. Attached is the
configuration that I ran into this with. If you need any other
information, please let me know!

Cheers,
Nathan

View attachment ".config" of type "text/plain" (155517 bytes)