On Wed, 22 Dec 2010, Andrew Morton wrote:
> > @@ -646,6 +647,15 @@ void __init initmem_init(unsigned long start_pfn, unsigned long last_pfn,
> > numa_set_node(i, 0);
> > memblock_x86_register_active_regions(0, start_pfn, last_pfn);
> > setup_node_bootmem(0, start_pfn << PAGE_SHIFT, last_pfn << PAGE_SHIFT);
> > +out: __maybe_unused
>
> hm, I didn't know you could do that with labels.
>
> Does it work?
>
Yeah, it's equivalent to __attribute__((unused)) and according to the gcc
manual section 6.30:
In GNU C, an attribute specifier list may appear after the colon
following a label, other than a case or default label. The only
attribute it makes sense to use after a label is unused. This
feature is intended for code generated by programs which contains
labels that may be unused but which is compiled with â-Wallâ. It
would not normally be appropriate to use in it human-written code,
though it could be useful in cases where the code that jumps to
the label is contained within an #ifdef conditional.
I used it because I knew I wouldn't get away with putting a label inside
an #ifdef :)
> > + for (i = 0; i < numa_possible_nodes; i++) {
> > + int nid;
> > +
> > + nid = first_unset_node(node_possible_map);
> > + if (nid == MAX_NUMNODES)
> > + break;
> > + node_set(nid, node_possible_map);
> > + }
> > }
> >
> > unsigned long __init numa_free_all_bootmem(void)