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

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Message-ID: <88d1b318-5c20-b3f4-6c24-60917c673f91@arm.com>
Date:   Thu, 26 Sep 2019 21:19:23 +0100
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     ard.biesheuvel@...aro.org, ndesaulniers@...gle.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/4] arm64: vdso32: Detect binutils support for dmb
 ishld

On 9/26/19 3:26 PM, Catalin Marinas wrote:
> 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?
> 

Forgot to squash a stash here. Will fix in v3. This is not used anymore was just
an experiment.

-- 
Regards,
Vincenzo