linux-kernel - Re: [PATCH v2 1/2] mm/userfaultfd: don't place zeropages when zeropages are disallowed

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Message-ID: <ZhfW7qzAGPQo3mJN@li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com>
Date: Thu, 11 Apr 2024 14:26:22 +0200
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, Sven Schnelle <svens@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mm/userfaultfd: don't place zeropages when
 zeropages are disallowed

On Wed, Mar 27, 2024 at 06:17:36PM +0100, David Hildenbrand wrote:

Hi David,
..
>  static int mfill_atomic_pte_zeropage(pmd_t *dst_pmd,
>  				     struct vm_area_struct *dst_vma,
>  				     unsigned long dst_addr)
> @@ -324,6 +355,9 @@ static int mfill_atomic_pte_zeropage(pmd_t *dst_pmd,
>  	spinlock_t *ptl;
>  	int ret;
>  
> +	if (mm_forbids_zeropage(dst_vma->mm))

I assume, you were going to pass dst_vma->vm_mm here?
This patch does not compile otherwise.
..

Thanks!