# \[PATCH 06/13\] mm/ksm: convert VMA flag tests to use vma\_flags\_t

- From: Lorenzo Stoakes (ARM) \<ljs@kernel.org\>
- Date: 2026-11-05 21:33:24 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2026/11/17874198
- Thread: https://ratatoskr.run/linux-mm/2026/11/17874173/t.md

```text
Replace use of the legacy vm_flags_t flags with vma_flags_t values where
KSM tests VMA flags directly.

The ksm_madvise() interface continues to take legacy flags for the time
being.

No functional change intended.

Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
---
 mm/ksm.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/mm/ksm.c b/mm/ksm.c
index d6f736a1aa2f..61b772bba229 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -779,7 +779,7 @@ static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm,
 	if (ksm_test_exit(mm))
 		return NULL;
 	vma = vma_lookup(mm, addr);
-	if (!vma || !(vma->vm_flags & VM_MERGEABLE) || !vma_has_anon_rmap(vma))
+	if (!vma || !vma_test(vma, VMA_MERGEABLE_BIT) || !vma_has_anon_rmap(vma))
 		return NULL;
 	return vma;
 }
@@ -1243,7 +1243,8 @@ static int unmerge_and_remove_all_rmap_items(void)
 			goto mm_exiting;
 
 		for_each_vma(vmi, vma) {
-			if (!(vma->vm_flags & VM_MERGEABLE) || !vma_has_anon_rmap(vma))
+			if (!vma_test(vma, VMA_MERGEABLE_BIT) ||
+			    !vma_has_anon_rmap(vma))
 				continue;
 			err = break_ksm(vma, vma->vm_start, vma->vm_end, false);
 			if (err)
@@ -2698,7 +2699,7 @@ static struct ksm_rmap_item *scan_get_next_rmap_item(struct page **page)
 		goto no_vmas;
 
 	for_each_vma(vmi, vma) {
-		if (!(vma->vm_flags & VM_MERGEABLE))
+		if (!vma_test(vma, VMA_MERGEABLE_BIT))
 			continue;
 		if (ksm_scan.address < vma->vm_start)
 			ksm_scan.address = vma->vm_start;
@@ -2890,7 +2891,7 @@ static int __ksm_del_vma(struct vm_area_struct *vma)
 {
 	int err;
 
-	if (!(vma->vm_flags & VM_MERGEABLE))
+	if (!vma_test(vma, VMA_MERGEABLE_BIT))
 		return 0;
 
 	if (vma_has_anon_rmap(vma)) {
@@ -3027,7 +3028,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
 
 	switch (advice) {
 	case MADV_MERGEABLE:
-		if (vma->vm_flags & VM_MERGEABLE)
+		if (vma_test(vma, VMA_MERGEABLE_BIT))
 			return 0;
 		if (!vma_ksm_compatible(vma))
 			return 0;
@@ -3484,7 +3485,7 @@ bool ksm_process_mergeable(struct mm_struct *mm)
 	mmap_assert_locked(mm);
 	VMA_ITERATOR(vmi, mm, 0);
 	for_each_vma(vmi, vma)
-		if (vma->vm_flags & VM_MERGEABLE)
+		if (vma_test(vma, VMA_MERGEABLE_BIT))
 			return true;
 
 	return false;

-- 
2.56.0


```