Re: kernel/uid16.c:184:2: error: implicit declaration of function 'groups_alloc'

[josh@joshtriplett.org]

Andrew,

On Mon, Jul 06, 2015 at 01:56:01PM -0700, Andrew Morton wrote:
> On Sun, 5 Jul 2015 07:30:38 +0800 kbuild test robot <fengguang.wu@intel.com> wrote:
> 
> > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   5c755fe142b421d295e7dd64a9833c12abbfd28e
> > commit: 2813893f8b197a14f1e1ddb04d99bce46817c84a kernel: conditionally support non-root users, groups and capabilities
> > date:   3 months ago
> > config: openrisc-allnoconfig (attached as .config)
> > reproduce:
> >   wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
> >   chmod +x ~/bin/make.cross
> >   git checkout 2813893f8b197a14f1e1ddb04d99bce46817c84a
> >   # save the attached .config to linux build tree
> >   make.cross ARCH=openrisc 
> > 
> > All error/warnings (new ones prefixed by >>):
> > 
> >    kernel/uid16.c: In function 'SYSC_setgroups16':
> > >> kernel/uid16.c:184:2: error: implicit declaration of function 'groups_alloc'
> >    kernel/uid16.c:184:13: warning: assignment makes pointer from integer without a cast
> 
> 
> Iulia, does the below look corect?  It will make setgroups16() return
> -ENOMEM, which seems inappropriate.

[...snip...]

How is the .config valid, given that UID16 *depends* on MULTIUSER?  This
shouldn't be possible, and I know Iulia specifically addressed this case
by adding that dependency (without which this *exact* error would
occur).

Is something doing "select UID16" and missing its dependency?  I don't
see any selects for UID16 anywhere in-tree.

- Josh Triplett

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