[v2 2/3] makedumpfile: use struct cycle to update cyclic region and clean up

[Baoquan He]

> > > Removing this check changes behaviour, not just clean up, so should be separated into another patch.
> > > 
> > > Further, this change seems buggy because, in addition to Kumaga-san's comment, memory outside of
> > > cycle region can be passed to here. Please look at the below.
> > 
> > Hi Both,
> > 
> > I understand your finding. How about put the pfn checking back to
> > set_bitmap_cyclic(). Maybe this is simpler and safer. Otherwise each
> > case need be taken care and adding the pfn checking.
> 
> Agreed, and this simple check may have a small influence on the
> performance, so I think it's OK to do it.
> 

Sorry to responsed so late. Will post v3 to adding back the pfn checking
in set_bitmap_cyclic. 

Thanks for your suggestion.

Baoquan
Thanks