Re: [PATCH v9 19/20] fs/dax: Properly refcount fs dax pages

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-static inline unsigned long dax_folio_share_put(struct folio *folio)
+static inline unsigned long dax_folio_put(struct folio *folio)
  {
-	return --folio->page.share;
+	unsigned long ref;
+	int order, i;
+
+	if (!dax_folio_is_shared(folio))
+		ref = 0;
+	else
+		ref = --folio->share;
+

It would still be good to learn how this non-atomic update here is safe (@Dan?), but that's independent of this series.

Staring at it, I would have thought we have to us an atomic_t here.

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb





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