Re: [PATCH 2/5] mm: rmap: add a ZONE_DEVICE folio warning in folio_referenced()
From: Baolin Wang
Date: Tue Feb 24 2026 - 00:50:12 EST
On 2/24/26 10:38 AM, Rik van Riel wrote:
On Tue, 2026-02-24 at 09:56 +0800, Baolin Wang wrote:
diff --git a/mm/rmap.c b/mm/rmap.c
index bff8f222004e..be785dfc9336 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1065,6 +1065,7 @@ int folio_referenced(struct folio *folio, int
is_locked,
.invalid_vma = invalid_folio_referenced_vma,
};
+ VM_WARN_ON_FOLIO(folio_is_zone_device(folio), folio);
*vm_flags = 0;
if (!pra.mapcount)
return 0;
Should be a VM_WARN_ON_ONCE_FOLIO so we do not cause
a softlockup if we try to print information about a
million ZONE_DEVICE pages?
Yes, sounds reasonable. Will do in next version. Thanks for reviewing.