[libvirt] [PATCH] Fix build w/o cgroups

[Roman Bogorodskiy]

  Eric Blake wrote:

> On 07/31/2013 11:27 PM, Roman Bogorodskiy wrote:
> > Build without cgroups support started to fail again recently. Do the
> > following to fix it:
> > 
> >  - Add missing 'partition' arg that was added to the
> >    virCgroupValidateMachineGroup() but forgotten for the stub
> >    of the same function
> >  - Add stubs for virCgroupMakeGroup() and virCgroupNew()
> > ---
> >  src/util/vircgroup.c | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> 
> Fails 'make syntax-check':
> 
> flags_usage
> src/util/vircgroup.c:1001:                              unsigned int
> flags ATTRIBUTE_UNUSED)
> maint.mk: flags should be checked with virCheckFlags
> 
> Don't know whether it makes more sense to add virCheckFlags(0, -1) or
> rename the parameter.
> 
> > +#else
> > +static int virCgroupMakeGroup(virCgroupPtr parent ATTRIBUTE_UNUSED,
> > +                              virCgroupPtr group ATTRIBUTE_UNUSED,
> > +                              bool create ATTRIBUTE_UNUSED,
> > +                              unsigned int flags ATTRIBUTE_UNUSED)
> > +{
> > +    return -1;
> 
> Returning failure without setting an error message is awkward.
> 
> 
> On 07/31/2013 11:34 PM, Roman Bogorodskiy wrote:
> > One more comment on that. It's probably the time to think how to
> > refactor this code, because it's becoming very hard to navigate through
> > preprocessor macros' mess...
> 
> Indeed; part of the confusion is figuring out which static functions are
> compiled under which conditions.  And since cgroups are really a
> Linux-only concept, maybe it's easier to just have one giant #if/else
> switch up front, rather than different conditionals for all the
> intermediate functions:
> 
> #if defined(__linux__) && HAVE_MNTENT_H && defined(HAVE_GETMNTENT_R) \
>  && defined(_DIRENT_HAVE_D_TYPE) && defined(major) && defined(minor)
> 
> real implementation of everything
> 
> #else
> 
> placeholder implementation of all functions in the header
> 
> #endif
> 
> Looking forward to v2.

Hi,

I've just published a patch with macros refactoring. As it's a different
thing I decided to go with a new patch instead of 'v2'.

Roman Bogorodskiy
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