On Mon, Feb 28, 2022 at 01:22:56PM +0000, David Howells wrote: > > Export PageHeadHuge() - it's used by folio_test_hugetlb() and thence by > such as folio_file_page() and folio_contains(). Matthew suggested I use > the first of those instead of doing the same calculation manually - but > I can't call it from a module. > > Kirill suggested rearranging things to put it in a header, but that > introduces header dependencies because of where constants are defined. > > Signed-off-by: David Howells <dhowells@xxxxxxxxxx> > cc: willy@xxxxxxxxxxxxx > Link: https://lore.kernel.org/r/163707085314.3221130.14783857863702203440.stgit@xxxxxxxxxxxxxxxxxxxxxx/ > > --- > mm/hugetlb.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 61895cc01d09..5768df43b05c 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -1854,6 +1854,7 @@ int PageHeadHuge(struct page *page_head) > > return page_head[1].compound_dtor == HUGETLB_PAGE_DTOR; > } > +EXPORT_SYMBOL(PageHeadHuge); EXPORT_SYMBOL_GPL for anything hugepage related, please.
