On 02/22/18 at 01:24pm, Andrew Morton wrote:
> On Thu, 22 Feb 2018 17:11:28 +0800 Baoquan He <b...@redhat.com> wrote:
> 
> > It's used to record how many memory sections are marked as present
> > during system boot up, and will be used in the later patch.
> > 
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -202,6 +202,7 @@ static inline int next_present_section_nr(int 
> > section_nr)
> >           (section_nr <= __highest_present_section_nr));    \
> >          section_nr = next_present_section_nr(section_nr))
> >  
> > +static int nr_present_sections;
> 
> I think this could be __initdata.
> 
> A nice comment explaining why it exists would be nice.

Thanks, I will update as you suggested.
> 

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