linux-kernel - Re: [PATCH v3 2/5] x86: hv: hv_init.c: Add functions to allocate/deallocate page for Hyper-V

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Message-ID: <20190629065046.GA20171@maya190131.isni1t2eisqetojrdim5hhf1se.xx.internal.cloudapp.net>
Date:   Sat, 29 Jun 2019 06:50:47 +0000
From:   Maya Nakamura <m.maya.nakamura@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     mikelley@...rosoft.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, sashal@...nel.org, x86@...nel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] x86: hv: hv_init.c: Add functions to
 allocate/deallocate page for Hyper-V

On Thu, Jun 27, 2019 at 11:38:14PM +0200, Thomas Gleixner wrote:
> Maya,
> 
> On Tue, 18 Jun 2019, Maya Nakamura wrote:
> 
> > diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> > index 0e033ef11a9f..e8960a83add7 100644
> > --- a/arch/x86/hyperv/hv_init.c
> > +++ b/arch/x86/hyperv/hv_init.c
> > @@ -37,6 +37,20 @@ EXPORT_SYMBOL_GPL(hyperv_pcpu_input_arg);
> >  u32 hv_max_vp_index;
> >  EXPORT_SYMBOL_GPL(hv_max_vp_index);
> >  
> > +void *hv_alloc_hyperv_page(void)
> > +{
> > +	BUILD_BUG_ON(PAGE_SIZE != HV_HYP_PAGE_SIZE);
> > +
> > +	return (void *)__get_free_page(GFP_KERNEL);
> > +}
> > +EXPORT_SYMBOL_GPL(hv_alloc_hyperv_page);
> > +
> > +void hv_free_hyperv_page(unsigned long addr)
> > +{
> > +	free_page(addr);
> > +}
> > +EXPORT_SYMBOL_GPL(hv_free_hyperv_page);
> 
> These functions need to be declared in a header file.
> 
> Thanks,
> 
> 	tglx
> 
Thank you for pointing that out, Thomas. I will resubmit my patch set to
include a header file with the function prototypes.