linux-kernel - Re: [PATCH stable-only] virtio-net: fix build on m68k and sparc64

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Message-ID: <CAMuHMdW4io2BcPvR-VwLMrCNReTEcUeNgO1ievVw+Eg=UdyeuA@mail.gmail.com>
Date:	Wed, 15 Jan 2014 10:01:49 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Miller <davem@...emloft.net>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH stable-only] virtio-net: fix build on m68k and sparc64

On Wed, Jan 15, 2014 at 9:46 AM, Michael S. Tsirkin <mst@...hat.com> wrote:
> On Wed, Jan 15, 2014 at 09:36:13AM +0100, Geert Uytterhoeven wrote:
>> On Wed, Jan 15, 2014 at 9:26 AM, Michael S. Tsirkin <mst@...hat.com> wrote:
>> > As a result of backporting a bugfix, virtio_net started passing void *
>> > to page_address, assuming that it will get silently converted to struct
>> > page *. But this does not happen on architectures where page_address is
>> > a macro, the result is build failure as the macro tries to dereference
>> > void*.
>> >
>> > Fix by reordering code slightly, so we always pass
>> > struct page * to page_address.
>>
>> Thanks for the clue! I was just investigating a similar failure in -next.
>>
>> Gr{oetje,eeting}s,
>>
>>                         Geert
>
> You don't mean linux-next? And not in virtio-net? I don't see page_address
> being used on void * anywhere there.

http://kisskb.ellerman.id.au/kisskb/buildresult/10469287/

I'm making {,set}page_address() static inline to fix this.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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