On 17.12.24 06:13, Alistair Popple wrote:
Longterm pinning of FS DAX pages should already be disallowed by
various pXX_devmap checks. However a future change will cause these
checks to be invalid for FS DAX pages so make
folio_is_longterm_pinnable() return false for FS DAX pages.
Nit: I'd consistently use "mm/gup:" as prefix for GUP-related patches.
(similarly, mm/huge_memory and mm/rmap in the other patches)
Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
include/linux/mm.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f267b06..01edca9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2078,6 +2078,10 @@ static inline bool folio_is_longterm_pinnable(struct folio *folio)
if (folio_is_device_coherent(folio))
return false;
+ /* DAX must also always allow eviction. */
+ if (folio_is_fsdax(folio))
+ return false;
+
/* Otherwise, non-movable zone folios can be pinned. */
return !folio_is_zone_movable(folio);
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
--
Cheers,
David / dhildenb
