[PATCH v3 20/25] mm/mlock: Skip ZONE_DEVICE PMDs during mlock

Alistair Popple
2024-11-22T01:42:48Z

At present mlock skips ptes mapping ZONE_DEVICE pages. A future change
to remove pmd_devmap will allow pmd_trans_huge_lock() to return
ZONE_DEVICE folios so make sure we continue to skip those.

Signed-off-by: Alistair Popple <apopple@nvidia.com>
---
mm/mlock.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/mlock.c b/mm/mlock.c
index e3e3dc2..567cf64 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -368,6 +368,8 @@ static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
if (is_huge_zero_pmd(*pmd))
goto out;
folio = pmd_folio(*pmd);
+ if (folio_is_zone_device(folio))
+ goto out;
if (vma->vm_flags & VM_LOCKED)
mlock_folio(folio);
else
--
git-series 0.9.1