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Re: addresses returned by __get_free_pages()

To: Martin Maletinsky <maletinsky@scs.ch>
Subject: Re: addresses returned by __get_free_pages()
From: "Stephen C. Tweedie" <sct@redhat.com>
Date: Fri, 8 Feb 2002 11:07:47 +0000
Cc: kernelnewbies@nl.linux.org, linux-mm@kvack.org
Fake-Sender: owner-linux-mm@kvack.org
In-Reply-To: <3C63989D.5D973803@scs.ch>; from maletinsky@scs.ch on Fri, Feb 08, 2002 at 10:21:33AM +0100
Original-Recipient: rfc822;linux-mm-archive@humbolt.geo.uu.nl
References: <3C63989D.5D973803@scs.ch>
Sender: Rik van Riel <riel@nl.linux.org>
User-Agent: Mutt/1.2.5.1i

Hi,

On Fri, Feb 08, 2002 at 10:21:33AM +0100, Martin Maletinsky wrote:
 
> In the 2.4.x kernel, can I apply the virt_to_page() macro to any address allocated by __get_free_pages() (i.e. when calling ret = __get_free_pages(flags, order), to any
> address in the interval [retval,  2^order * PAGE_SIZE])?

Yes, but it's easier just to call "alloc_pages(flags, order)", which
returns a struct page in the first place.

> In other words are those addresses guaranteed to be kernel logical addresses (i.e. between PAGE_OFFSET and PAGE_OFFSET + high_memory (on ix86))?

Yes, unless you specify GFP_HIGHMEM in the allocation flags.

Cheers,
 Stephen
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References:
- addresses returned by __get_free_pages()
  - From: Martin Maletinsky <maletinsky@scs.ch>

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