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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.
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