* David Rientjes <rientjes@xxxxxxxxxx> wrote:
> On Thu, 21 Mar 2013, Ingo Molnar wrote:
>
> > > Index: linux/mm/page_alloc.c
> > > ===================================================================
> > > --- linux.orig/mm/page_alloc.c 2013-03-18 10:52:11.510988843 -0500
> > > +++ linux/mm/page_alloc.c 2013-03-18 10:52:14.214931348 -0500
> > > @@ -4161,10 +4161,19 @@ int __meminit __early_pfn_to_nid(unsigne
> > > {
> > > unsigned long start_pfn, end_pfn;
> > > int i, nid;
> > > + static unsigned long last_start_pfn, last_end_pfn;
> > > + static int last_nid;
> >
> > Please move these globals out of function local scope, to make it more
> > apparent that they are not on-stack. I only noticed it in the second pass.
>
> The way they're currently defined places these in meminit.data as
> appropriate; if they are moved out, please make sure to annotate their
> definitions with __meminitdata.
I'm fine with having them within the function as well in this special
case, as long as a heavy /* NOTE: ... */ warning is put before them -
which explains why these SMP-unsafe globals are safe.
( That warning will also act as a visual delimiter that breaks the
normally confusing and misleading 'globals mixed amongst stack
variables' pattern. )
Thanks,
Ingo
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