linux-kernel - Re: [PATCH]fix VM_CAN_NONLINEAR check in sys_remap_file

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Message-Id: <20071008100456.dbe826d0.akpm@linux-foundation.org>
Date:	Mon, 8 Oct 2007 10:04:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Yan Zheng" <yanzheng@...n.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH]fix VM_CAN_NONLINEAR check in sys_remap_file_pages

On Mon, 8 Oct 2007 19:45:08 +0800 "Yan Zheng" <yanzheng@...n.com> wrote:

> Hi all
> 
> The test for VM_CAN_NONLINEAR always fails
> 
> Signed-off-by: Yan Zheng<yanzheng@...n.com>
> ----
> diff -ur linux-2.6.23-rc9/mm/fremap.c linux/mm/fremap.c
> --- linux-2.6.23-rc9/mm/fremap.c	2007-10-07 15:03:33.000000000 +0800
> +++ linux/mm/fremap.c	2007-10-08 19:33:44.000000000 +0800
> @@ -160,7 +160,7 @@
>  	if (vma->vm_private_data && !(vma->vm_flags & VM_NONLINEAR))
>  		goto out;
> 
> -	if (!vma->vm_flags & VM_CAN_NONLINEAR)
> +	if (!(vma->vm_flags & VM_CAN_NONLINEAR))
>  		goto out;
> 
>  	if (end <= start || start < vma->vm_start || end > vma->vm_end)

Lovely.  From this we can deduce that nobody has run remap_file_pages() since
2.6.23-rc1 and that nobody (including the developer who made that change) ran it
while that change was in -mm.

I'm surprise that LTP doesn't have any remap_file_pages() tests.

Have you runtime tested this change?

Thanks.
-
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