[PATCH v5 16/36] mm/khugepaged: skip private node folios when trying to collapse.

[Gregory Price]

A collapse operation causes new THP allocation to occur, and may
migrate memory from one node to another.

Handle this the same as zone_device for now (disallow collapse).

Signed-off-by: Gregory Price <gourry@xxxxxxxxxx>
---
 mm/khugepaged.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 89ce6bcbc376b..fb4378cc17b10 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -700,7 +700,7 @@ static enum scan_result __collapse_huge_page_isolate(struct vm_area_struct *vma,
 			goto out;
 		}
 		page = vm_normal_page(vma, addr, pteval);
-		if (unlikely(!page) || unlikely(is_zone_device_page(page))) {
+		if (unlikely(!page) || unlikely(page_is_private_managed(page))) {
 			result = SCAN_PAGE_NULL;
 			goto out;
 		}
@@ -1687,7 +1687,7 @@ static enum scan_result collapse_scan_pmd(struct mm_struct *mm,
 		}
 
 		page = vm_normal_page(vma, addr, pteval);
-		if (unlikely(!page) || unlikely(is_zone_device_page(page))) {
+		if (unlikely(!page) || unlikely(page_is_private_managed(page))) {
 			result = SCAN_PAGE_NULL;
 			goto out_unmap;
 		}
@@ -1944,7 +1944,7 @@ static enum scan_result try_collapse_pte_mapped_thp(struct mm_struct *mm, unsign
 		}
 
 		page = vm_normal_page(vma, addr, ptent);
-		if (WARN_ON_ONCE(page && is_zone_device_page(page)))
+		if (WARN_ON_ONCE(page && page_is_private_managed(page)))
 			page = NULL;
 		/*
 		 * Note that uprobe, debugger, or MAP_PRIVATE may change the
-- 
2.53.0-Meta