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

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Date:   Fri, 25 Mar 2022 13:41:32 +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: Re: [GIT PULL] Kbuild -std=gnu11 updates for v5.17-rc1

Sorry, the email subject,

    Kbuild -std=gnu11 updates for v5.17-rc1

contains a typo.
It should be for "v5.18-rc1" , of course.





On Fri, Mar 25, 2022 at 11:37 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> 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



-- 
Best Regards
Masahiro Yamada