linux-kernel - Re: [PATCH v7 3/4] mm: add vma_assert_locked() for !CONFIG_PER_VMA

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Date: Thu, 15 Feb 2024 14:19:41 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: Lokesh Gidra <lokeshgidra@...gle.com>
Cc: akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, selinux@...r.kernel.org, 
	kernel-team@...roid.com, aarcange@...hat.com, peterx@...hat.com, 
	david@...hat.com, axelrasmussen@...gle.com, bgeffon@...gle.com, 
	willy@...radead.org, jannh@...gle.com, kaleshsingh@...gle.com, 
	ngeoffray@...gle.com, timmurray@...gle.com, rppt@...nel.org, 
	Liam.Howlett@...cle.com, ryan.roberts@....com
Subject: Re: [PATCH v7 3/4] mm: add vma_assert_locked() for !CONFIG_PER_VMA_LOCK

On Thu, Feb 15, 2024 at 10:28 AM Lokesh Gidra <lokeshgidra@...gle.com> wrote:
>
> vma_assert_locked() is needed to replace mmap_assert_locked() once we
> start using per-vma locks in userfaultfd operations.
>
> In !CONFIG_PER_VMA_LOCK case when mm is locked, it implies that the
> given VMA is locked.

Yes, makes sense. With per-vma locks used in more places, this makes
replacing mmap_assert_locked() with vma_assert_locked() very
straight-forward.

>
> Signed-off-by: Lokesh Gidra <lokeshgidra@...gle.com>

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

> ---
>  include/linux/mm.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 3c85634b186c..5ece3ad34ef8 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -781,6 +781,11 @@ static inline struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm,
>         return NULL;
>  }
>
> +static inline void vma_assert_locked(struct vm_area_struct *vma)
> +{
> +       mmap_assert_locked(vma->vm_mm);
> +}
> +
>  static inline void release_fault_lock(struct vm_fault *vmf)
>  {
>         mmap_read_unlock(vmf->vma->vm_mm);
> --
> 2.43.0.687.g38aa6559b0-goog
>