From: "Stephen C. Tweedie" <sct@redhat.com>
To: Martin Maletinsky <maletinsky@scs.ch>
Cc: kernelnewbies@nl.linux.org, linux-mm@kvack.org
Subject: Re: addresses returned by __get_free_pages()
Date: Fri, 8 Feb 2002 11:07:47 +0000 [thread overview]
Message-ID: <20020208110747.A2354@redhat.com> (raw)
In-Reply-To: <3C63989D.5D973803@scs.ch>; from maletinsky@scs.ch on Fri, Feb 08, 2002 at 10:21:33AM +0100
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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prev parent reply other threads:[~2002-02-08 11:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-08 9:21 addresses returned by __get_free_pages() Martin Maletinsky
2002-02-08 11:07 ` Stephen C. Tweedie [this message]
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