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Message-ID: <2cd57c900504122010430af248@mail.gmail.com>
Date: Wed, 13 Apr 2005 11:10:35 +0800
From: Coywolf Qi Hunt <coywolf@gmail.com>
Reply-To: Coywolf Qi Hunt <coywolf@gmail.com>
To: "akpm@osdl.org" <akpm@osdl.org>
Subject: Re: [patch 006/198] arm: add comment about max_low_pfn/max_pfn
Cc: torvalds@osdl.org, linux-kernel@vger.kernel.org, rmk+lkml@arm.linux.org.uk,
       rmk@arm.linux.org.uk
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I told rmk about this long time ago.

On 4/12/05, akpm@osdl.org <akpm@osdl.org> wrote:
> 
> From: Russell King <rmk+lkml@arm.linux.org.uk>
> 
> Oddly, max_low_pfn/max_pfn end up being the number of pages in the system,
> rather than the maximum PFN on ARM.  This doesn't seem to cause any problems,
> so just add a note about it.
> 
> Signed-off-by: Russell King <rmk@arm.linux.org.uk>
> Signed-off-by: Andrew Morton <akpm@osdl.org>
> ---
> 
>  25-akpm/arch/arm/mm/init.c |    3 +++
>  1 files changed, 3 insertions(+)
> 
> diff -puN arch/arm/mm/init.c~arm-add-comment-about-max_low_pfn-max_pfn arch/arm/mm/init.c
> --- 25/arch/arm/mm/init.c~arm-add-comment-about-max_low_pfn-max_pfn     2005-04-12 03:21:04.967381744 -0700
> +++ 25-akpm/arch/arm/mm/init.c  2005-04-12 03:21:04.971381136 -0700
> @@ -223,6 +223,9 @@ find_memend_and_nodes(struct meminfo *mi
>          * This doesn't seem to be used by the Linux memory
>          * manager any more.  If we can get rid of it, we
>          * also get rid of some of the stuff above as well.
> +        *
> +        * Note: max_low_pfn and max_pfn reflect the number
> +        * of _pages_ in the system, not the maximum PFN.
>          */
>         max_low_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);
>         max_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);
> _


-- 
Coywolf Qi Hunt
http://sosdg.org/~coywolf/
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