linux-kernel - Re: [PATCH 1/1] Drivers: hv: Move Hyper-V extended capability check to arch neutral code

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Date:   Sat, 5 Jun 2021 10:25:33 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Sunil Muthuswamy <sunilmut@...rosoft.com>
Cc:     Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: Re: [PATCH 1/1] Drivers: hv: Move Hyper-V extended capability check
 to arch neutral code

On Fri, Jun 04, 2021 at 12:14:09AM +0000, Sunil Muthuswamy wrote:
> > The extended capability query code is currently under arch/x86, but it
> > is architecture neutral, and is used by arch neutral code in the Hyper-V
> > balloon driver. Hence the balloon driver fails to build on other
> > architectures.
> > 
> > Fix by moving the ext cap code out from arch/x86.  Because it is also
> > called from built-in architecture specific code, it can't be in a module,
> > so the Makefile treats as built-in even when CONFIG_HYPERV is "m".  Also
> > drivers/Makefile is tweaked because this is the first occurrence of a
> > Hyper-V file that is built-in even when CONFIG_HYPERV is "m".
> > 
> > While here, update the hypercall status check to use the new helper
> > function instead of open coding. No functional change.
> > 
> 
> Thanks for taking care of this, Michael.
> 
> Reviewed-by: Sunil Muthuswamy <sunilmut@...rosoft.com>

Applied to hyperv-next. Thanks.