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: <alpine.DEB.2.21.1906272334560.32342@nanos.tec.linutronix.de>
Date:   Thu, 27 Jun 2019 23:38:14 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Maya Nakamura <m.maya.nakamura@...il.com>
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

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