linux-kernel - Re: [PATCH 1/3] mm/memory: Change vmf_anon

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Date: Wed, 21 Feb 2024 03:36:46 +0000
From: Matthew Wilcox <willy@...radead.org>
To: "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, muchun.song@...ux.dev
Subject: Re: [PATCH 1/3] mm/memory: Change vmf_anon_prepare() to be non-static

On Tue, Feb 20, 2024 at 03:14:22PM -0800, Vishal Moola (Oracle) wrote:
> In order to handle hugetlb faults under the VMA lock, hugetlb can use
> vmf_anon_prepare() to ensure we can safely prepare an anon_vma. Change
> it to be a non-static function so it can be used within hugetlb as well.

I think the prototype for this should probably live in mm/internal.h?

> +++ b/include/linux/hugetlb.h
> @@ -272,6 +272,7 @@ void hugetlb_vma_unlock_write(struct vm_area_struct *vma);
>  int hugetlb_vma_trylock_write(struct vm_area_struct *vma);
>  void hugetlb_vma_assert_locked(struct vm_area_struct *vma);
>  void hugetlb_vma_lock_release(struct kref *kref);
> +vm_fault_t vmf_anon_prepare(struct vm_fault *vmf);
>  
>  int pmd_huge(pmd_t pmd);
>  int pud_huge(pud_t pud);
>