linux-kernel - Re: [PATCH v1 1/3] arm64: add a macro for SError synchronization

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Date:   Thu, 2 Nov 2017 16:52:37 +0800
From:   gengdongjiu <gengdongjiu@...wei.com>
To:     Mark Rutland <mark.rutland@....com>
CC:     Robin Murphy <robin.murphy@....com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <marc.zyngier@....com>,
        <christoffer.dall@...aro.org>, <james.morse@....com>,
        <ard.biesheuvel@...aro.org>, <cov@...eaurora.org>,
        <Dave.Martin@....com>, <suzuki.poulose@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kvmarm@...ts.cs.columbia.edu>
Subject: Re: [PATCH v1 1/3] arm64: add a macro for SError synchronization


On 2017/11/1 22:16, Mark Rutland wrote:
>> it will report Error.
> Alternatives cannot be nested. You need to define a cap like:
> 
>   ARM64_HAS_RAS_NOT_IESB
> 
> ... which is set when ARM64_HAS_RAS_EXTN && !ARM64_HAS_IESB.
> 
> Then you can do:
> 
> alternative_if ARM64_HAS_RAS_NOT_IESB
> 	esb
> alternative_else_nop_endif
> 
> See ARM64_ALT_PAN_NOT_UAO for an example.
> 
> That said, as Robin points out we may not even need the alternative.

Ok, got it. thank you very much for your point and opinion


> 
> Thanks,
> Mark.