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

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Message-ID: <20071008115236.GB2460@hacking>
Date:	Mon, 8 Oct 2007 19:52:36 +0800
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	Yan Zheng <yanzheng@...n.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH]fix VM_CAN_NONLINEAR check in sys_remap_file_pages

On Mon, Oct 08, 2007 at 07:45:08PM +0800, Yan Zheng 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))

Good catch!

! operator has higher priority than & operator.

Acked by me. ;-)


> 		goto out;
>
> 	if (end <= start || start < vma->vm_start || end > vma->vm_end)


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