linux-kernel - Re: [PATCH v2 4/7] Revert "arm64: vdso: Fix compilation with clang older than 8"

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Date:   Mon, 31 Aug 2020 21:56:01 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        clang-built-linux@...glegroups.com,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] Revert "arm64: vdso: Fix compilation with clang
 older than 8"

On Mon, Aug 31, 2020 at 05:23:23PM -0700, Nick Desaulniers wrote:
> This reverts commit 3acf4be235280f14d838581a750532219d67facc.
> 
> The minimum supported version of clang is clang 10.0.1.
> 
> Suggested-by: Nathan Chancellor <natechancellor@...il.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  arch/arm64/kernel/vdso/Makefile | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
> index 45d5cfe46429..04021a93171c 100644
> --- a/arch/arm64/kernel/vdso/Makefile
> +++ b/arch/arm64/kernel/vdso/Makefile
> @@ -43,13 +43,6 @@ ifneq ($(c-gettimeofday-y),)
>    CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
>  endif
>  
> -# Clang versions less than 8 do not support -mcmodel=tiny
> -ifeq ($(CONFIG_CC_IS_CLANG), y)
> -  ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0)
> -    CFLAGS_REMOVE_vgettimeofday.o += -mcmodel=tiny
> -  endif
> -endif
> -
>  # Disable gcov profiling for VDSO code
>  GCOV_PROFILE := n
>  
> -- 
> 2.28.0.402.g5ffc5be6b7-goog
>