linux-kernel - Re: [PATCH v2 4/5] hugetlb: Use vmf_anon_prepare() instead of anon_vma

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZdbEtEa-G-EuZ2n2@casper.infradead.org>
Date: Thu, 22 Feb 2024 03:51:16 +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 v2 4/5] hugetlb: Use vmf_anon_prepare() instead of
 anon_vma_prepare()

On Wed, Feb 21, 2024 at 03:47:31PM -0800, Vishal Moola (Oracle) wrote:
> hugetlb_no_page() and hugetlb_wp() call anon_vma_prepare(). In
> preparation for hugetlb to safely handle faults under the VMA lock,
> use vmf_anon_prepare() here instead.
> 
> Additionally, passing hugetlb_wp() the vm_fault struct from hugetlb_fault()
> works toward cleaning up the hugetlb code and function stack.

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>

>  static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
>  		       unsigned long address, pte_t *ptep, unsigned int flags,
> -		       struct folio *pagecache_folio, spinlock_t *ptl)
> +		       struct folio *pagecache_folio, spinlock_t *ptl,
> +		       struct vm_fault *vmf)

Is it worth removing vma, address and flags?