linux-kernel - Re: Could convert a buffer that allocated by vmalloc to pages?

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Message-ID: <20070123154202.GA8892@athena.road.mcmartin.ca>
Date:	Tue, 23 Jan 2007 10:42:02 -0500
From:	Kyle McMartin <kyle@...isc-linux.org>
To:	Yu-Chen Wu <g944370@...nthu.edu.tw>
Cc:	'Anton Altaparmakov' <aia21@....ac.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: Could convert a buffer that allocated by vmalloc to pages?

On Tue, Jan 23, 2007 at 10:15:33PM +0800, Yu-Chen Wu wrote:
> printk(KERN_INFO "vmalloc_to_page tpage :%x\n",tpage);
> //===========info of dmesg==================
<snip>
> [ 1561.768492] page allocated:60ea9000
> [ 1561.768497] vmalloc_to_page tpage :7fcf7e18
> 
> Why the page address get from vmalloc_to_page is different with the first
> page address of the vm_struct (73d65000)?
> 

Memory returned by vmalloc is only virtually contiguous, not physically
contiguous. If you're allocating memory for DMA, see the interface
documented in Documentation/DMA-mapping.txt for more information.

-- Kyle
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