On Fri, 2016-07-15 at 09:20 +1000, Balbir Singh wrote: > > == > > + ((unsigned long)end & (unsigned > > long)PAGE_MASK))) > > + return NULL; > > + > > + /* Allow if start and end are inside the same compound > > page. */ > > + endpage = virt_to_head_page(end); > > + if (likely(endpage == page)) > > + return NULL; > > + > > + /* Allow special areas, device memory, and sometimes > > kernel data. */ > > + if (PageReserved(page) && PageReserved(endpage)) > > + return NULL; > > If we came here, it's likely that endpage > page, do we need to check > that only the first and last pages are reserved? What about the ones > in > the middle? I think this will be so rare, we can get away with just checking the beginning and the end. -- All Rights Reversed.
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