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

From: Masahiro Yamada <masahiroy@kernel.org>
To: linux-kbuild@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nicolas Schier <nicolas@fjasle.eu>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-modules@vger.kernel.org, llvm@lists.linux.dev,
	Ard Biesheuvel <ardb@kernel.org>,
	Sami Tolvanen <samitolvanen@google.com>,
	Masahiro Yamada <masahiroy@kernel.org>
Subject: [PATCH v6 00/10] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL_CRCS, export.h)
Date: Fri, 13 May 2022 20:39:20 +0900	[thread overview]
Message-ID: <20220513113930.10488-1-masahiroy@kernel.org> (raw)

This is the third batch of cleanups in this development cycle.

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@kernel.org/
  - New
    Resent of my previous submission
    https://lore.kernel.org/linux-kbuild/20210831074004.3195284-11-masahiroy@kernel.org/

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