linux-kernel - Re: [RFC] [PATCH] virtual memmap on sparsemem v3 [2/4] generic virtual mem

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Date:	Sat, 9 Dec 2006 22:17:00 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, clameter@...r.sgi.com,
	apw@...dowen.org, akpm@...l.org
Subject: Re: [RFC] [PATCH] virtual memmap on sparsemem v3 [2/4] generic
 virtual mem_map on sparsemem

On Sat, 9 Dec 2006 13:05:47 +0100
Heiko Carstens <heiko.carstens@...ibm.com> wrote:

> > +#ifdef CONFIG_SPARSEMEM_VMEMMAP
> > +#if (((BITS_PER_LONG/4) * PAGES_PER_SECTION) % PAGE_SIZE) != 0
> > +#error "PAGE_SIZE/SECTION_SIZE relationship is not suitable for vmem_map"
> > +#endif
> 
> Why the BITS_PER_LONG/4? Or to put in other words: why not simply
> PAGES_PER_SECTION % PAGE_SIZE != 0 ?
> 
sorry, my mistake. What I wanted to do was

32bits arch --
4 * PAGES_PER_SECTION % PAGE_SIZE
64bits arch --
8 * PAGES_PER_SECTION % PAGE_SIZE

I'll renew this in the next week.

-Kame

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