linux-kernel - Re: [PATCH 0/2] Remove '-mno-global-merge' from KBUILD

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Message-ID: <CAK7LNAS6C6Uj9cCQ0o=bYF1F-EVD=VgdR8YYx-1PJc9toX_HZA@mail.gmail.com>
Date:   Fri, 1 Apr 2022 22:03:41 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Kees Cook <keescook@...omium.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-um@...ts.infradead.org, llvm@...ts.linux.dev,
        patches@...ts.linux.dev
Subject: Re: [PATCH 0/2] Remove '-mno-global-merge' from KBUILD_CFLAGS

On Thu, Mar 31, 2022 at 8:46 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> As discussed at [1] and [2], this series removes '-mno-global-merge'
> from KBUILD_CFLAGS for clang, as it causes warnings for UML, and it
> no longer appears to be necessary, as I do not see any modpost warnings
> with LLVM 11 through 15 with several different ARCH=arm and ARCH=arm64
> configurations.
>
> [1] is currently in the UML tree, destined for 5.18, but it is buggy, as
> I note in [2]. This series is an alternative to [2], which has not been
> picked up yet, so it is based on the current UML tree. If [2] is picked
> up, I can rework the first patch to remove the '-mno-global-merge'
> filtering from arch/um/Makefile; otherwise, this should be picked up in
> place of [2].
>
> I intentionally kept the first patch vague around what fixed the modpost
> warnings, as I am not too sure. [3] seems somewhat likely, but I don't
> think that will revert cleanly on main to test. I think the testing is
> enough to show that the original issue is resolved but I do note that we
> can add this flag back in the architecture specific Makefiles if needed.
>
> Please review and ack as necessary.


Both applied to linux-kbuild/fixes.




> [1]: https://lore.kernel.org/r/20220303090643.241747-1-davidgow@google.com/
> [2]: https://lore.kernel.org/r/20220322173547.677760-1-nathan@kernel.org/
> [3]: https://github.com/llvm/llvm-project/commit/863bfdbfb446adaef767ff514d1f2ffb5d489562
>
> Nathan Chancellor (2):
>   kbuild: Remove '-mno-global-merge'
>   Revert "um: clang: Strip out -mno-global-merge from USER_CFLAGS"
>
>  Makefile         | 4 ----
>  arch/um/Makefile | 4 ----
>  2 files changed, 8 deletions(-)
>
>
> base-commit: 82017457957a550d7d00dde419435dd74a890887
> --
> 2.35.1
>


-- 
Best Regards
Masahiro Yamada