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Re: max_pfn: Uninitialized, or Deprecated?

To: "Kevin D. Kissell" <>
Subject: Re: max_pfn: Uninitialized, or Deprecated?
From: Geert Uytterhoeven <>
Date: Wed, 2 Apr 2008 09:16:52 +0200 (CEST)
Cc: Linux/MIPS Development <>, Linux Kernel Development <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <>
On Tue, 1 Apr 2008, Kevin D. Kissell wrote:
> Once upon a time, the global max_pfn value was set up as part of
> bootmem_init(), but this seems to have been dropped in favor of
> establishing max_low_pfn, I suppose to be clear that it's the max
> non-highmem PFN.  However, the global max_pfn gets used in
> the MIPS APRP support code,  and also in places like
> block/blk-settings.c.  Is the use of max_pfn supposed to be
> deprecated, such that we consider blk-settings.c to be broken
> and change arch/mips/kernel/vpe.c to use max_low_pfn, or
> ought we assign  max_pfn = max_low_pfn in bootmem_init()?

I noticed this too when investigating why initrds no longer worked on
m68k (Fix in, still not in mainline).

Apparently a value of max_pfn = 0 is OK, as several architectures
(including MIPS and m68k) don't touch it?



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds

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