linux-kernel - [GIT PULL] Kbuild -std=gnu11 updates for v5.17-rc1

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Message-ID: <CAK7LNAQ2HET1QHG17m1vdCGMoRm6Lj=sAe+cj2Via_LHx3xBPg@mail.gmail.com>
Date:   Fri, 25 Mar 2022 11:37:37 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [GIT PULL] Kbuild -std=gnu11 updates for v5.17-rc1

Hi Linus,

This is a small patch set for -std=gnu11 migration.
As you requested, I separated this out.
I will send the second pull request later for the rest
of kbuild updates.

Thank you.





The following changes since commit 754e0b0e35608ed5206d6a67a791563c631cec07:

  Linux 5.17-rc4 (2022-02-13 12:13:30 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
kbuild-gnu11-v5.18

for you to fetch changes up to 1e24078113ae69c741cb1b03375a9f1490db7308:

  Kbuild: use -std=gnu11 for KBUILD_USERCFLAGS (2022-03-13 17:31:44 +0900)

----------------------------------------------------------------
Kbuild -std=gnu11 updates for v5.18

Linus pointed out the benefits of C99 some years ago, especially variable
declarations in loops [1]. At that time, we were not ready for the
migration due to old compilers.

Recently, Jakob Koschel reported a bug in list_for_each_entry(), which
leaks the invalid pointer out of the loop [2]. In the discussion, we
agreed that the time had come. Now that GCC 5.1 is the minimum compiler
version, there is nothing to prevent us from going to -std=gnu99, or even
straight to -std=gnu11.

Discussions for a better list iterator implementation are ongoing, but
this patch set must land first.

[1] https://lore.kernel.org/all/CAHk-=wgr12JkKmRd21qh-se-_Gs69kbPgR9x4C+Es-yJV2GLkA@mail.gmail.com/
[2] https://lore.kernel.org/lkml/86C4CE7D-6D93-456B-AA82-F8ADEACA40B7@gmail.com/

----------------------------------------------------------------
Arnd Bergmann (3):
      Kbuild: add -Wno-shift-negative-value where -Wextra is used
      Kbuild: move to -std=gnu11
      Kbuild: use -std=gnu11 for KBUILD_USERCFLAGS

Mark Rutland (1):
      Kbuild: use -Wdeclaration-after-statement

 Documentation/process/programming-language.rst                    | 6 +++---
 Documentation/translations/it_IT/process/programming-language.rst | 4 ++--
 Documentation/translations/zh_CN/process/programming-language.rst | 3 +--
 Documentation/translations/zh_TW/process/programming-language.rst | 3 +--
 Makefile                                                          | 7 ++++---
 arch/arm64/kernel/vdso32/Makefile                                 | 3 ++-
 drivers/gpu/drm/i915/Makefile                                     | 1 +
 drivers/staging/greybus/tools/Makefile                            | 3 ++-
 fs/btrfs/Makefile                                                 | 1 +
 scripts/Makefile.extrawarn                                        | 1 +
 scripts/mod/modpost.c                                             | 4 +++-
 11 files changed, 21 insertions(+), 15 deletions(-)


-- 
Best Regards
Masahiro Yamada