[RFC v2 1/8] page_flags: add is_folio_hwpoison()

[Luis Chamberlain]

Provide a helper similar to is_page_hwpoison() for folios
which tests the first head and if the folio is large any page in
the folio is tested for the poison flag.

Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
---
 include/linux/page-flags.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 1c68d67b832f..4d5f395edf03 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -883,6 +883,13 @@ static inline bool is_page_hwpoison(struct page *page)
 	return PageHuge(page) && PageHWPoison(compound_head(page));
 }
 
+static inline bool is_folio_hwpoison(struct folio *folio)
+{
+       if (folio_test_hwpoison(folio))
+               return true;
+       return folio_test_large(folio) && folio_test_has_hwpoisoned(folio);
+}
+
 /*
  * For pages that are never mapped to userspace (and aren't PageSlab),
  * page_type may be used.  Because it is initialised to -1, we invert the
-- 
2.39.2