linux-kernel - Re: [PATCH 1/1] pagemap clear_refs: modify to specify anon or mapped vma clearing

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Message-ID: <alpine.DEB.2.00.0907281401150.7140@chino.kir.corp.google.com>
Date:	Tue, 28 Jul 2009 14:01:45 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Moussa A. Ba" <moussa.a.ba@...il.com>
cc:	linux-kernel@...r.kernel.org, xiyou.wangcong@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Matt Mackall <mpm@...enic.com>, Mel Gorman <mel@....ul.ie>,
	Ying Han <yinghan@...gle.com>, Nick Piggin <npiggin@...e.de>,
	jaredeh@...il.com
Subject: Re: [PATCH 1/1] pagemap clear_refs: modify to specify anon or mapped
 vma clearing

On Tue, 28 Jul 2009, Moussa A. Ba wrote:

> --- a/fs/proc/task_mmu.c	2009-07-21 14:30:01.000000000 -0700
> +++ b/fs/proc/task_mmu.c	2009-07-27 17:05:25.000000000 -0700
> @@ -462,6 +462,10 @@ static int clear_refs_pte_range(pmd_t *
>  	return 0;
>  }
> 
> +#define CLEAR_REFS_ALL 1
> +#define CLEAR_REFS_ANON 2
> +#define CLEAR_REFS_MAPPED 3
> +
>  static ssize_t clear_refs_write(struct file *file, const char __user * buf,
>  				size_t count, loff_t * ppos)
>  {
> @@ -469,13 +473,15 @@ static ssize_t clear_refs_write(struct f
>  	char buffer[PROC_NUMBUF], *end;
>  	struct mm_struct *mm;
>  	struct vm_area_struct *vma;
> +	int type;
> 
>  	memset(buffer, 0, sizeof(buffer));
>  	if (count > sizeof(buffer) - 1)
>  		count = sizeof(buffer) - 1;
>  	if (copy_from_user(buffer, buf, count))
>  		return -EFAULT;
> -	if (!simple_strtol(buffer, &end, 0))
> +	type = simple_strtol(buffer, &end, 0);
> +	if (!type || type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
>  		return -EINVAL;
>  	if (*end == '\n')
>  		end++;

The test for type < CLEAR_REFS_ALL covers !type.
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