On Thu, Jan 18, 2018 at 06:38:10AM -0800, Dave Hansen wrote: > On 01/18/2018 05:12 AM, Kirill A. Shutemov wrote: > > - if (pte_page(*pvmw->pte) - pvmw->page >= > > - hpage_nr_pages(pvmw->page)) { > > Is ->pte guaranteed to map a page which is within the same section as > pvmw->page? Otherwise, with sparsemem (non-vmemmap), the pointer > arithmetic won't work.
No, it's not guaranteed. It can be arbitrary page. The arithmetic won't work because they are different "memory objects"? -- Kirill A. Shutemov