linux-kernel - [PATCH v7 10/21] tools/testing/vma: Implement vm

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Message-Id: <20250903-slub-percpu-caches-v7-10-71c114cdefef@suse.cz>
Date: Wed, 03 Sep 2025 14:59:52 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Suren Baghdasaryan <surenb@...gle.com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Christoph Lameter <cl@...two.org>, David Rientjes <rientjes@...gle.com>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>, 
 Harry Yoo <harry.yoo@...cle.com>, Uladzislau Rezki <urezki@...il.com>, 
 Sidhartha Kumar <sidhartha.kumar@...cle.com>, linux-mm@...ck.org, 
 linux-kernel@...r.kernel.org, rcu@...r.kernel.org, 
 maple-tree@...ts.infradead.org, vbabka@...e.cz
Subject: [PATCH v7 10/21] tools/testing/vma: Implement vm_refcnt reset

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

Add the reset of the ref count in vma_lock_init().  This is needed if
the vma memory is not zeroed on allocation.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 tools/testing/vma/vma_internal.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h
index 3639aa8dd2b06ebe5b9cfcfe6669994fd38c482d..2f1c586400cfd65413d2ff82199590b43796b18c 100644
--- a/tools/testing/vma/vma_internal.h
+++ b/tools/testing/vma/vma_internal.h
@@ -1418,8 +1418,8 @@ static inline void ksm_exit(struct mm_struct *mm)

 static inline void vma_lock_init(struct vm_area_struct *vma, bool reset_refcnt)
 {
-	(void)vma;
-	(void)reset_refcnt;
+	if (reset_refcnt)
+		refcount_set(&vma->vm_refcnt, 0);
 }

 static inline void vma_numab_state_init(struct vm_area_struct *vma)

-- 
2.51.0