linux-kernel - Re: [PATCH 0/3] cfi: Use __builtin_function

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Message-ID: <CAKwvOdmHarC+O71PPJwUSnP4oZjknD0FHPZ5b9JbMJ-xOgwMwg@mail.gmail.com>
Date:   Fri, 1 Apr 2022 13:49:18 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH 0/3] cfi: Use __builtin_function_start

On Fri, Apr 1, 2022 at 1:19 PM Sami Tolvanen <samitolvanen@...gle.com> wrote:
>
> Clang 14 introduced the __builtin_function_start intrinsic, which
> makes it possible to cleanly implement the function_nocfi() macro in a
> way that also works with static initializers. Add a default
> function_nocfi() implementation and drop the arm64 inline assembly
> version.

For the series
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

I wouldn't mind if patch 1/3 included a link to the llvm commit in the
commit message.

Link: https://github.com/llvm/llvm-project/commit/ec2e26eaf63558934f5b73a6e530edc453cf9508
Link: https://github.com/ClangBuiltLinux/linux/issues/1353

>
> Sami Tolvanen (3):
>   kbuild: Change CFI_CLANG to depend on __builtin_function_start
>   linux/compiler-clang.h: define function_nocfi
>   arm64: Drop the inline assembly implementation of function_nocfi
>
>  arch/Kconfig                      |  5 +----
>  arch/arm64/include/asm/compiler.h | 16 ----------------
>  include/linux/compiler-clang.h    | 10 ++++++++++
>  init/Kconfig                      |  3 +++
>  4 files changed, 14 insertions(+), 20 deletions(-)
>
> --
> 2.35.0
>


-- 
Thanks,
~Nick Desaulniers