Re: [PATCH v6 00/10] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL_CRCS, export.h)

[Masahiro Yamada]

Hi Matoro,

Thanks for the report.


I have qemu-system-sparc installed on my Ubuntu machine,
so I think I will be able to test it on sparc, at least.

How did you test these 4 architectures (sparc, alpha, riscv, ia64)?
QEMU?

Thanks




On Sat, Aug 6, 2022 at 8:39 AM matoro
<matoro_mailinglist_kernel@xxxxxxxxx> wrote:
>
> Hi Masahiro, I'm sorry to raise this after release but this seems to be
> broken on SOME architectures.  So far I have tested:
>
> Affected - sparc, alpha
> Unaffected - riscv, ia64
>
> The affected systems are unable to load modules, similar to the
> previously reported issue.  All module loading fails with "disagrees
> about version of symbol module_layout".
>
> Bisect blames 7b4537199a4a8480b8c3ba37a2d44765ce76cd9b, but this does
> not revert cleanly.  Presumably CONFIG_MODVERSIONS=n would fix, but this
> is a pretty core feature.
>
> Unlike the issue Sedat reported, this is on a GNU toolchain, no clang
> involved.
>
> Here are the configs I am using (with make olddefconfig on upgrade to
> 5.19):
>
> Broken - sparc - https://dpaste.com/5A8F2JD6U
> Broken - alpha - https://dpaste.com/FYKK23L9X
> Working - riscv - https://dpaste.com/HV6Y4V6NT
> Working - ia64 - https://dpaste.com/HDLDNEAK4
>
> Please let me know if there's anything I can do to help track down this
> regression.
>
>
> -------- Original Message --------
> Subject: Re: [PATCH v6 00/10] kbuild: yet another series of cleanups
> (modpost, LTO, MODULE_REL_CRCS, export.h)
> Date: 2022-05-13 08:20
>  From: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> To: Linux Kbuild mailing list <linux-kbuild@xxxxxxxxxxxxxxx>
>
> On Fri, May 13, 2022 at 8:42 PM Masahiro Yamada <masahiroy@xxxxxxxxxx>
> wrote:
> >
> >
> > This is the third batch of cleanups in this development cycle.
> >
>
>
> This series is available at
> git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
>   lto-cleanup-v6
>
>
> >
> > Changes in v6:
> >   - Fix false-positive warnings when CONFIG_TRIM_UNUSED_KSYMS=y
> >
> > Changes in v5:
> >   - Fix the build error when CONFIG_DEBUG_INFO_BTF=y (reported by
> > Nathan)
> >   - Clean up arch/m68k/include/asm/export.h (Nick)
> >   - Keep gen_symversions (and will be removed by a later patch)
> >   - Add more comments in the script
> >
> > Changes in v4:
> >   - Rename .vmlinux-symver.c to .vmlinux.export.c
> >     because I notice this approach is useful for further cleanups,
> >     not only for modversioning but also for overall EXPORT_SYMBOL.
> >   - New patch
> >   - New.
> >     Resent of my previous submission.
> >
> > https://lore.kernel.org/all/20210831074004.3195284-10-masahiroy@xxxxxxxxxx/
> >   - New
> >     Resent of my previous submission
> >
> > https://lore.kernel.org/linux-kbuild/20210831074004.3195284-11-masahiroy@xxxxxxxxxx/
> >
> > Changes in v3:
> >   - New patch
> >
> > Changes in v2:
> >   - Simplify the implementation (parse .cmd files after ELF)
> >   - New patch
> >  - replace the chain of $(if ...) with $(and )
> >   - New patch
> >   - New patch
> >
> > Masahiro Yamada (10):
> >   modpost: extract symbol versions from *.cmd files
> >   kbuild: link symbol CRCs at final link, removing
> >     CONFIG_MODULE_REL_CRCS
> >   kbuild: stop merging *.symversions
> >   genksyms: adjust the output format to modpost
> >   kbuild: do not create *.prelink.o for Clang LTO or IBT
> >   kbuild: check static EXPORT_SYMBOL* by script instead of modpost
> >   kbuild: make built-in.a rule robust against too long argument error
> >   kbuild: make *.mod rule robust against too long argument error
> >   kbuild: add cmd_and_savecmd macro
> >   kbuild: rebuild multi-object modules when objtool is updated
> >
> >  arch/m68k/include/asm/Kbuild    |   1 +
> >  arch/m68k/include/asm/export.h  |   2 -
> >  arch/powerpc/Kconfig            |   1 -
> >  arch/s390/Kconfig               |   1 -
> >  arch/um/Kconfig                 |   1 -
> >  include/asm-generic/export.h    |  22 ++-
> >  include/linux/export-internal.h |  16 +++
> >  include/linux/export.h          |  30 ++--
> >  init/Kconfig                    |   4 -
> >  kernel/module.c                 |  10 +-
> >  scripts/Kbuild.include          |  10 +-
> >  scripts/Makefile.build          | 134 ++++++------------
> >  scripts/Makefile.lib            |   7 -
> >  scripts/Makefile.modfinal       |   5 +-
> >  scripts/Makefile.modpost        |   9 +-
> >  scripts/check-local-export      |  64 +++++++++
> >  scripts/genksyms/genksyms.c     |  18 +--
> >  scripts/link-vmlinux.sh         |  33 ++---
> >  scripts/mod/modpost.c           | 236 +++++++++++++++++++++-----------
> >  19 files changed, 320 insertions(+), 284 deletions(-)
> >  delete mode 100644 arch/m68k/include/asm/export.h
> >  create mode 100644 include/linux/export-internal.h
> >  create mode 100755 scripts/check-local-export
> >
> > --
> > 2.32.0
> >
>


-- 
Best Regards
Masahiro Yamada