linux-kernel - [PATCH 0/4] kbuild: build speed improvment of CONFIG_TRIM_UNUSED

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Date:   Fri, 26 Feb 2021 01:02:42 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jessica Yu <jeyu@...nel.org>, Nicolas Pitre <nico@...xnic.net>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH 0/4] kbuild: build speed improvment of CONFIG_TRIM_UNUSED_KSYMS


Now CONFIG_TRIM_UNUSED_KSYMS is revived, but Linus is still unhappy
about the build speed.

I re-implemented this feature, and the build time cost is now
almost unnoticeable level.

I hope this makes Linus happy.



Masahiro Yamada (4):
  kbuild: fix UNUSED_KSYMS_WHITELIST for Clang LTO
  export.h: make __ksymtab_strings per-symbol section
  kbuild: separate out vmlinux.lds generation
  kbuild: re-implement CONFIG_TRIM_UNUSED_KSYMS to make it work in
    one-pass

 Makefile                          | 34 ++++++------
 arch/alpha/kernel/Makefile        |  3 +-
 arch/arc/kernel/Makefile          |  3 +-
 arch/arm/kernel/Makefile          |  3 +-
 arch/arm64/kernel/Makefile        |  3 +-
 arch/csky/kernel/Makefile         |  3 +-
 arch/h8300/kernel/Makefile        |  2 +-
 arch/hexagon/kernel/Makefile      |  3 +-
 arch/ia64/kernel/Makefile         |  3 +-
 arch/m68k/kernel/Makefile         |  2 +-
 arch/microblaze/kernel/Makefile   |  3 +-
 arch/mips/kernel/Makefile         |  3 +-
 arch/nds32/kernel/Makefile        |  3 +-
 arch/nios2/kernel/Makefile        |  2 +-
 arch/openrisc/kernel/Makefile     |  3 +-
 arch/parisc/kernel/Makefile       |  3 +-
 arch/powerpc/kernel/Makefile      |  2 +-
 arch/riscv/kernel/Makefile        |  2 +-
 arch/s390/kernel/Makefile         |  3 +-
 arch/sh/kernel/Makefile           |  3 +-
 arch/sparc/kernel/Makefile        |  2 +-
 arch/um/kernel/Makefile           |  2 +-
 arch/x86/kernel/Makefile          |  2 +-
 arch/xtensa/kernel/Makefile       |  3 +-
 include/asm-generic/export.h      | 25 +--------
 include/asm-generic/vmlinux.lds.h | 29 +++++++++--
 include/linux/export.h            | 56 +++++---------------
 init/Kconfig                      |  4 +-
 scripts/Makefile.build            |  7 +--
 scripts/adjust_autoksyms.sh       | 76 ---------------------------
 scripts/gen-keep-ksyms.sh         | 86 +++++++++++++++++++++++++++++++
 scripts/gen_autoksyms.sh          | 55 --------------------
 scripts/gen_ksymdeps.sh           | 25 ---------
 scripts/lto-used-symbollist.txt   |  5 --
 scripts/module.lds.S              | 38 ++++++++++----
 35 files changed, 210 insertions(+), 291 deletions(-)
 delete mode 100755 scripts/adjust_autoksyms.sh
 create mode 100755 scripts/gen-keep-ksyms.sh
 delete mode 100755 scripts/gen_autoksyms.sh
 delete mode 100755 scripts/gen_ksymdeps.sh
 delete mode 100644 scripts/lto-used-symbollist.txt

-- 
2.27.0