linux-kernel - Re: linux-next: Tree for Jan 12 (build failures: m68k, ppc)

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Date:	Thu, 15 Jan 2015 11:12:13 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Linux-Next <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Clark <robdclark@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>
Subject: Re: linux-next: Tree for Jan 12 (build failures: m68k, ppc)

On Mon, Jan 12, 2015 at 6:59 PM, Guenter Roeck <linux@...ck-us.net> wrote:
>> > Build failures, seen since next-20150109:
>> >         m68k:allmodconfig
>> >         powerpc:ppc6xx_defconfig

It looks like parisc is also suffering:
http://kisskb.ellerman.id.au/kisskb/buildresult/12343847/

>> > Due to:
>> >         ERROR: "__get_user_bad" [drivers/gpu/drm/drm.ko] undefined!
>> >         make[1]: *** [__modpost] Error 1
>> >
>> > Caused by commit d34f20d6e2f (drm: Atomic modeset ioctl).
>>
>> Yeah, it needs a get_user() that supports 64-bit data.
>>
> Hi Geert,
>
> I assume you mean m68k, where 64 bit support for get_user has been disabled.
>
> The problem on powerpc is different though: __get_user_nocheck()
> and __get_user_check() use
>         unsigned long __gu_val;
> followed by
>         __get_user_size(__gu_val, __gu_addr, (size), __gu_err);
>
> __get_user_size() fails in
>         if (size > sizeof(x))
>                  (x) = __get_user_bad();
>
> Presumably "unsigned long" is 32 bit on 32 bit powerpc, not 64 bit.
>
> Overall, the explicit 64-bit use of get_user() seems to be quite unusual.

I noticed you've sent a fix for DRM.

Doh, and I was just fixing m68k...

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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