linux-kernel - Re: [PATCH 12/15] hyperv: move VMBus connection ids to uapi

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Message-ID: <A0B941A0-5609-42CF-BF82-3DE5BD215EC9@zytor.com>
Date:   Mon, 09 Jan 2017 00:40:48 -0800
From:   hpa@...or.com
To:     Roman Kagan <rkagan@...tuozzo.com>,
        Paolo Bonzini <pbonzini@...hat.com>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Christoph Hellwig <hch@...radead.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Denis V . Lunev" <den@...nvz.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 12/15] hyperv: move VMBus connection ids to uapi

On January 9, 2017 12:32:23 AM PST, Roman Kagan <rkagan@...tuozzo.com> wrote:
>On Mon, Jan 02, 2017 at 09:19:57AM +0100, Paolo Bonzini wrote:
>> On 28/12/2016 18:09, Roman Kagan wrote:
>> > Am I correct assuming that QEMU is currently the only user of
>> > arch/x86/include/uapi/asm/hyperv.h?
>> > 
>> > Then I think we're fine withdrawing it from uapi as a whole and
>letting
>> > QEMU pull it in through its header-harvesting scripts (as does now
>> > anyway).  This would lift all licensing and longterm API stability
>> > expectations.
>> 
>> Actually, QEMU's header-harvesting scripts use uapi/ headers
>> exclusively, since they are built on "make headers_install".
>> 
>> The extra cleanups that QEMU does on top are to allow compilation of
>the
>> headers on non-Linux machines.  They don't really do much more than
>> changing Linux (linux/types.h) integer types to the C99 (stdint.h)
>> equivalents.
>
>Ouch, I stand corrected.
>
>So what should we do with it then?  I'm sorta lost...
>
>We certainly can give it up and live with a private copy of the
>definitions in the QEMU tree but that doesn't sound optimal in any
>sense.
>
>Thanks,
>Roman.

Why do that through header mangling rather than typedef?
-- 
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