linux-kernel - Re: [PATCH v8 12/23] tools/testing/vma: Implement vm

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Message-ID: <CAJuCfpEBOAGN+hLssuAma473B5-m-cA4CN3xEyjoM8WXcQv-6Q@mail.gmail.com>
Date: Thu, 25 Sep 2025 09:38:47 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Christoph Lameter <cl@...two.org>, 
	David Rientjes <rientjes@...gle.com>, 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
Subject: Re: [PATCH v8 12/23] tools/testing/vma: Implement vm_refcnt reset

On Wed, Sep 10, 2025 at 1:01 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> 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>

Reviewed-by: Suren Baghdasaryan <surenb@...gle.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
>