linux-kernel - Re: [PATCH v2 2/4] arm64: vdso32: Detect binutils support for dmb ishld

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Message-ID: <2e1e562c-ff9d-9cd4-afd5-e5e8d813f0fc@arm.com>
Date:   Thu, 26 Sep 2019 22:17:30 +0100
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ard.biesheuvel@...aro.org, ndesaulniers@...gle.com,
        will@...nel.org, tglx@...utronix.de
Subject: Re: [PATCH v2 2/4] arm64: vdso32: Detect binutils support for dmb
 ishld



On 9/26/19 4:59 PM, Catalin Marinas wrote:
> On Thu, Sep 26, 2019 at 02:38:03PM +0100, Vincenzo Frascino wrote:
>>  arch/arm64/kernel/vdso32/Makefile            | 9 +++++++++
> 
> Could you please also remove the unnecessary gcc-goto.sh check in this
> file? We don't use jump labels in the vdso (can't run-time patch them).
> I found it while forcing COMPATCC=clang with my additional diff and I
> get the warning on 'make clean'.
>

I will do it in a separate cleanup patch, I want to keep this only for the error
reported by Will.

> diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
> index 22f0d31ea528..038357a1e835 100644
> --- a/arch/arm64/kernel/vdso32/Makefile
> +++ b/arch/arm64/kernel/vdso32/Makefile
> @@ -40,9 +38,6 @@ VDSO_CAFLAGS += $(call cc32-option,-fno-PIE)
>  ifdef CONFIG_DEBUG_INFO
>  VDSO_CAFLAGS += -g
>  endif
> -ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(COMPATCC)), y)
> -VDSO_CAFLAGS += -DCC_HAVE_ASM_GOTO
> -endif
>  
>  # From arm Makefile
>  VDSO_CAFLAGS += $(call cc32-option,-fno-dwarf2-cfi-asm)
> 

-- 
Regards,
Vincenzo