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From: Martin Maletinsky <maletinsky@scs.ch>
To: kernelnewbies@nl.linux.org, linux-mm@kvack.org
Subject: addresses returned by __get_free_pages()
Date: Fri, 08 Feb 2002 10:21:33 +0100	[thread overview]
Message-ID: <3C63989D.5D973803@scs.ch> (raw)

Hello,

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])?

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

I know that in the 2.2.x kernel this used to be the case (i.e. __get_free_pages() returned kernel
logical addresses, to which virt_to_page() could be applied), but I don't quite understand the
memory managment of 2.4.x yet.

Thanks in advance for any help
regards
Martin


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Martin Maletinsky                 phone: +41 (0)1 445 16 05
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             reply	other threads:[~2002-02-08  9:21 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-02-08  9:21 Martin Maletinsky [this message]
2002-02-08 11:07 ` Stephen C. Tweedie

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