On Sat, Jun 16, 2018 at 07:00:46PM -0700, Matthew Wilcox wrote: > Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx> > --- <> > +static void *dax_make_page_entry(struct page *page, void *entry) > +{ > + pfn_t pfn = page_to_pfn_t(page); > + return dax_make_entry(pfn, dax_is_pmd_entry(entry)); > +} This function is defined and never used, so we get: fs/dax.c:106:14: warning: ‘dax_make_page_entry’ defined but not used [-Wunused-function] static void *dax_make_page_entry(struct page *page, void *entry) ^~~~~~~~~~~~~~~~~~~