linux-kernel - Re: [PATCH -mmotm] Remove ->nopfn check from use_zero

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Date:	Fri, 27 Jun 2008 12:55:47 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Johannes Weiner <hannes@...urebad.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mmotm] Remove ->nopfn check from use_zero_page

On Fri, 27 Jun 2008, Johannes Weiner wrote:

> Hi Andrew,
> 
> The get_user_pages fix from Linus came to -mm through -next as it seems,
> but -mm has Nick's nopfn removal patches already and so use_zero_page
> checks for a non-existant vm_op.
> 
> This patch is needed to at least compile.
> 
> Signed-off-by: Johannes Weiner <hannes@...urebad.de>

Please try yesterday's .DATE=2008-06-26-14-32 mmotm,
I sent Andrew a similar fix and it should be okay now.
Also includes fix to endless bad page states once you boot.

Hugh

> ---
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 08cd653..5d7e705 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -1082,11 +1082,10 @@ static inline int use_zero_page(struct vm_area_struct *vma)
>  	if (vma->vm_flags & (VM_LOCKED | VM_SHARED))
>  		return 0;
>  	/*
> -	 * And if we have a fault or a nopfn routine, it's not an
> -	 * anonymous region.
> +	 * And if we have a fault routine, it's not an anonymous
> +	 * region.
>  	 */
> -	return !vma->vm_ops ||
> -		(!vma->vm_ops->fault && !vma->vm_ops->nopfn);
> +	return !vma->vm_ops || !vma->vm_ops->fault;
>  }
>  
>  int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
> --
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