From: Wei Yang <richard.weiyang@xxxxxxxxx> Subject: mm: page->mapping folio->mapping should have the same offset As with the other members of folio, the offset of page->mapping and folio->mapping must be the same. The compile-time check was inadvertently removed during development. Add it back. [willy@xxxxxxxxxxxxx: changelog redo] Link: https://lkml.kernel.org/r/20220104011734.21714-1-richard.weiyang@xxxxxxxxx Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx> Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/mm_types.h | 1 + 1 file changed, 1 insertion(+) --- a/include/linux/mm_types.h~mm-page-mapping-folio-mapping-should-have-the-same-offset +++ a/include/linux/mm_types.h @@ -261,6 +261,7 @@ static_assert(sizeof(struct page) == siz static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl)) FOLIO_MATCH(flags, flags); FOLIO_MATCH(lru, lru); +FOLIO_MATCH(mapping, mapping); FOLIO_MATCH(compound_head, lru); FOLIO_MATCH(index, index); FOLIO_MATCH(private, private); _
