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

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Date:	Wed, 15 Jan 2014 11:15:18 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
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 10:01:49AM +0100, Geert Uytterhoeven wrote:
> 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/

Wew, so it's not my fault :)

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

Yes, I don't see why it has to be a macro.

> 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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