linux-kernel - [PATCH v2 0/4] kbuild: build speed improvement of CONFIG_TRIM_UNUSED

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Message-Id: <20210309151737.345722-1-masahiroy@kernel.org>
Date:   Wed, 10 Mar 2021 00:17:33 +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>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH v2 0/4] kbuild: build speed improvement 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.


(no changes since v1)

Masahiro Yamada (4):
  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
  kbuild: remove guarding from TRIM_UNUSED_KSYMS

 Makefile                                      | 34 ++++-----
 arch/alpha/kernel/Makefile                    |  3 +-
 arch/arc/kernel/Makefile                      |  3 +-
 arch/arm/kernel/Makefile                      |  3 +-
 arch/arm64/kernel/Makefile                    |  3 +-
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S             |  1 +
 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/powerpc/kernel/vdso32/vdso32.lds.S       |  1 +
 arch/powerpc/kernel/vdso64/vdso64.lds.S       |  1 +
 arch/riscv/kernel/Makefile                    |  2 +-
 arch/s390/kernel/Makefile                     |  3 +-
 arch/s390/purgatory/purgatory.lds.S           |  1 +
 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             | 13 ++--
 include/linux/export.h                        | 56 ++++----------
 include/linux/ksyms.lds.h                     | 22 ++++++
 init/Kconfig                                  |  3 +-
 scripts/Makefile.build                        |  7 +-
 scripts/Makefile.lib                          |  1 +
 scripts/adjust_autoksyms.sh                   | 73 -------------------
 .../{gen_autoksyms.sh => gen-keep-ksyms.sh}   | 43 ++++++++---
 scripts/gen_ksymdeps.sh                       | 25 -------
 scripts/module.lds.S                          | 23 +++---
 39 files changed, 152 insertions(+), 238 deletions(-)
 create mode 100644 include/linux/ksyms.lds.h
 delete mode 100755 scripts/adjust_autoksyms.sh
 rename scripts/{gen_autoksyms.sh => gen-keep-ksyms.sh} (66%)
 delete mode 100755 scripts/gen_ksymdeps.sh

-- 
2.27.0