Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Received-SPF: None (esa5.hc3370-68.iphmx.com: no sender
  authenticity information available from domain of
  andrew.cooper3@citrix.com) identity=pra;
  client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com;
  envelope-from="Andrew.Cooper3@citrix.com";
  x-sender="andrew.cooper3@citrix.com";
  x-conformance=sidf_compatible
Received-SPF: Pass (esa5.hc3370-68.iphmx.com: domain of
  Andrew.Cooper3@citrix.com designates 162.221.158.21 as
  permitted sender) identity=mailfrom;
  client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com;
  envelope-from="Andrew.Cooper3@citrix.com";
  x-sender="Andrew.Cooper3@citrix.com";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133
  ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4
  ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88
  ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ~all"
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  authenticity information available from domain of
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  envelope-from="Andrew.Cooper3@citrix.com";
  x-sender="postmaster@mail.citrix.com";
  x-conformance=sidf_compatible
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 fm4=
Subject: Re: [Xen-devel] [PATCH] ARM: xen: unexport HYPERVISOR_platform_op
 function
To:     Arnd Bergmann <arnd@arndb.de>
CC:     Stefano Stabellini <sstabellini@kernel.org>,
        Emil Velikov <emil.l.velikov@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        "Denis Efremov" <efremov@linux.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        xen-devel <xen-devel@lists.xenproject.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Julien Grall <julien.grall@arm.com>
References: <20190906153948.2160342-1-arnd@arndb.de>
 <7abad95e-ea47-c068-d91c-ba503f2530b9@citrix.com>
 <CAK8P3a1qkMLW_Wnn-N0seUw4N5bPwTU7Dy7CwOWxzS6NTnTmiQ@mail.gmail.com>
From:   Andrew Cooper <andrew.cooper3@citrix.com>
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Message-ID: <bda2a05b-e2d0-feee-761b-88deeeac2449@citrix.com>
Date:   Fri, 6 Sep 2019 18:20:15 +0100
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 06/09/2019 17:00, Arnd Bergmann wrote:
> On Fri, Sep 6, 2019 at 5:55 PM Andrew Cooper <andrew.cooper3@citrix.com> wrote:
>> On 06/09/2019 16:39, Arnd Bergmann wrote:
>>> HYPERVISOR_platform_op() is an inline function and should not
>>> be exported. Since commit 15bfc2348d54 ("modpost: check for
>>> static EXPORT_SYMBOL* functions"), this causes a warning:
>>>
>>> WARNING: "HYPERVISOR_platform_op" [vmlinux] is a static EXPORT_SYMBOL_GPL
>>>
>>> Remove the extraneous export.
>>>
>>> Fixes: 15bfc2348d54 ("modpost: check for static EXPORT_SYMBOL* functions")
>>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>> Something is wonky.  That symbol is (/ really ought to be) in the
>> hypercall page and most definitely not inline.
>>
>> Which tree is that changeset from?  I can't find the SHA.
> This is from linux-next, I think from the kbuild tree.

Thanks.

Julien/Stefano: Why are any of these hypercalls out-of-line?  ARM
doesn't use the hypercall page, and there is no argument translation
(not even in arm32 as there are no 5-argument hypercalls declared).

They'd surely be easier to implement with a few static inlines and some
common code, than to try and replicate the x86 side hypercall_page
interface ?

~Andrew