[RFC PATCH v4 06/27] mm/mlock: skip mlock for managed-memory folios

[Gregory Price]

Private node folios are managed by device drivers and should not be
mlocked.  The existing folio_is_zone_device check is already correctly
placed to handle this - simply extend it for private nodes.

Signed-off-by: Gregory Price <gourry@xxxxxxxxxx>
---
 mm/mlock.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/mlock.c b/mm/mlock.c
index 2f699c3497a5..c56159253e45 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -25,6 +25,7 @@
 #include <linux/memcontrol.h>
 #include <linux/mm_inline.h>
 #include <linux/secretmem.h>
+#include <linux/node_private.h>
 
 #include "internal.h"
 
@@ -366,7 +367,7 @@ 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))
+		if (unlikely(folio_is_private_managed(folio)))
 			goto out;
 		if (vma->vm_flags & VM_LOCKED)
 			mlock_folio(folio);
@@ -386,7 +387,7 @@ static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
 		if (!pte_present(ptent))
 			continue;
 		folio = vm_normal_folio(vma, addr, ptent);
-		if (!folio || folio_is_zone_device(folio))
+		if (!folio || unlikely(folio_is_private_managed(folio)))
 			continue;
 
 		step = folio_mlock_step(folio, pte, addr, end);
-- 
2.53.0