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

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Date:   Wed, 31 May 2017 16:37:07 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "x86\@kernel.org" <x86@...nel.org>, devel@...uxdriverproject.org,
        "linux-kernel\@vger.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

Andy Shevchenko <andy.shevchenko@...il.com> writes:

> 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?
>

CONFIG_HYPERV can be set to "m" but we want to include the contents of
hyperv/ in vmlinux, not in vmbus module.

>> +#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)

Sure, I'm just trying to avoid such things as later people come with
'fix checkpatch.pl warning' patches.

-- 
  Vitaly