linux-kernel - Re: [PATCH v5 01/10] x86/hyper-v: include hyperv/ only when CONFIG

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Date:   Tue, 30 May 2017 19:24:33 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     "x86@...nel.org" <x86@...nel.org>, devel@...uxdriverproject.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jork Loeser <Jork.Loeser@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v5 01/10] x86/hyper-v: include hyperv/ only when
 CONFIG_HYPERV is set

On Tue, May 30, 2017 at 2:34 PM, Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
> Code is arch/x86/hyperv/ is only needed when CONFIG_HYPERV is set, the
> 'basic' support and detection lives in arch/x86/kernel/cpu/mshyperv.c
> which is included when CONFIG_HYPERVISOR_GUEST is set.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> Acked-by: K. Y. Srinivasan <kys@...rosoft.com>
> Tested-by: Simon Xiao <sixiao@...rosoft.com>
> Tested-by: Srikanth Myakam <v-srm@...rosoft.com>
> ---
>  arch/x86/Kbuild                 |  4 +++-
>  arch/x86/include/asm/mshyperv.h | 10 +++++++++-
>  2 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
> index 586b786..3fa0a3c 100644
> --- a/arch/x86/Kbuild
> +++ b/arch/x86/Kbuild
> @@ -8,7 +8,9 @@ obj-$(CONFIG_KVM) += kvm/
>  obj-$(CONFIG_XEN) += xen/
>
>  # Hyper-V paravirtualization support
> -obj-$(CONFIG_HYPERVISOR_GUEST) += hyperv/
> +ifdef CONFIG_HYPERV
> +obj-y += hyperv/
> +endif

Can
obj-$(CONFIG_HYPERV) += hyperv/
work for you instead?

> +#else /* CONFIG_HYPERV */
> +static inline void hyperv_init(void) {}

> +static inline bool hv_is_hypercall_page_setup(void)
> +{
> +       return false;
> +}

Can it be one line? (It's okay in this case if it goes ~83 characters,
for example)

-- 
With Best Regards,
Andy Shevchenko