linux-kernel - Re: [PATCH v2 3/7] ACPI / processor: Introduce invalid_logical

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Date:	Tue, 05 May 2015 11:12:52 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v2 3/7] ACPI / processor: Introduce invalid_logical_cpuid()

On 05/04/2015 10:46 PM, Hanjun Guo wrote:
> In ACPI processor drivers, we use direct comparisons of cpu logical
> id with -1 which are error prone in case logical cpuid is accidentally
> assinged an error code and prevents us from returning an error-encoding
> cpuid directly in some cases.


Which is exactly what Xen code does (xen_pcpu_id() and 
xen_hotadd_cpu()). And patch 4/7 fixes this.


-boris

>
> So introduce invalid_logical_cpuid() to identify cpu with invalid
> logical cpu num, then it will be used to replace the direct comparisons
> with -1.

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