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

diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h
index f8cf5b184d5b51dd627ff440943a7af3c549f482..6b6e2b05918c9f95b537f26e20a943b34082825a 100644
--- a/tools/testing/vma/vma_internal.h
+++ b/tools/testing/vma/vma_internal.h
@@ -1373,6 +1373,8 @@ static inline void ksm_exit(struct mm_struct *mm)
 
 static inline void vma_lock_init(struct vm_area_struct *vma, bool 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

On Wed, Sep 10, 2025 at 1:01 AM Vlastimil Babka <vbabka@suse.cz> wrote:
>
> From: "Liam R. Howlett" <Liam.Howlett@oracle.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@oracle.com>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

Reviewed-by: Suren Baghdasaryan <surenb@google.com>



> ---
>  tools/testing/vma/vma_internal.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h
> index f8cf5b184d5b51dd627ff440943a7af3c549f482..6b6e2b05918c9f95b537f26e20a943b34082825a 100644
> --- a/tools/testing/vma/vma_internal.h
> +++ b/tools/testing/vma/vma_internal.h
> @@ -1373,6 +1373,8 @@ static inline void ksm_exit(struct mm_struct *mm)
>
>  static inline void vma_lock_init(struct vm_area_struct *vma, bool 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
>