linux-kernel - Re: [PATCH v4 3/4] ARM: only use -mtp=cp15 for the compiler

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Date:   Fri, 14 Oct 2022 14:20:02 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v4 3/4] ARM: only use -mtp=cp15 for the compiler

On Fri, Oct 14, 2022 at 01:13:53PM -0700, Nick Desaulniers wrote:
> Avoids an error from the assembler for CONFIG_THUMB2 kernels:
> 
> clang-15: error: hardware TLS register is not supported for the thumbv4t
> sub-architecture
> 
> This flag only makes sense to pass to the compiler, not the assembler.
> 
> Perhaps CFLAGS_ABI can be renamed to CPPFLAGS_ABI to reflect that they
> will be passed to both the compiler and assembler for sources that
> require pre-processing.
> 
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  arch/arm/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 8dd943b50b7d..ee888070b2ff 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -111,7 +111,7 @@ CFLAGS_ABI	+= -meabi gnu
>  endif
>  
>  ifeq ($(CONFIG_CURRENT_POINTER_IN_TPIDRURO),y)
> -CFLAGS_ABI	+= -mtp=cp15
> +KBUILD_CFLAGS	+= -mtp=cp15
>  endif
>  
>  # Accept old syntax despite ".syntax unified"
> -- 
> 2.38.0.413.g74048e4d9e-goog
>