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

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Date:   Thu, 26 Sep 2019 15:26:43 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Vincenzo Frascino <vincenzo.frascino@....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 Thu, Sep 26, 2019 at 02:38:03PM +0100, Vincenzo Frascino wrote:
> diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild
> index d6465823b281..75cf8c796d0e 100644
> --- a/arch/arm64/Kbuild
> +++ b/arch/arm64/Kbuild
> @@ -4,3 +4,9 @@ obj-$(CONFIG_NET)	+= net/
>  obj-$(CONFIG_KVM)	+= kvm/
>  obj-$(CONFIG_XEN)	+= xen/
>  obj-$(CONFIG_CRYPTO)	+= crypto/
> +
> +# as-instr-compat
> +# Usage: cflags-y += $(call as-instr-compat,instr,option1,option2)
> +
> +as-instr-compat = $(call try-run,\
> +	printf "%b\n" "$(1)" | $(COMPATCC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))

This doesn't seem to be used anywhere. Was it meant to be replaced by
cc32-as-instr?

-- 
Catalin