linux-kernel - Re: [PATCH 2/2 v5][resend] tmpfs: interleave the starting node of /dev/shmem

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Date:	Mon, 23 Jul 2012 13:58:19 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Nick Piggin <npiggin@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/2 v5][resend] tmpfs: interleave the starting node of
 /dev/shmem

On Mon, Jul 09, 2012 at 09:46:39AM -0500, Nathan Zimmer wrote:
> +static unsigned long shmem_interleave(struct vm_area_struct *vma,
> +					unsigned long addr)
> +{
> +	unsigned long offset;
> +
> +	/* Use the vm_files prefered node as the initial offset. */
> +	offset = (unsigned long *) vma->vm_private_data;

Should this be?:
	offset = (unsigned long)vma->vm_private_data;

offset is an unsigned long, not a pointer.  ->vm_private_data is a
void pointer.

It causes a GCC warning:
mm/shmem.c: In function ‘shmem_interleave’:
mm/shmem.c:1341:9: warning: assignment makes integer from pointer without a cast [enabled by default]

> +
> +	offset += ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
> +
> +	return offset;
> +}
>  #endif

regards,
dan carpenter
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