From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: linux-kernel@vger.kernel.org, clameter@engr.sgi.com,
apw@shadowen.org, akpm@osdl.org
Subject: Re: [RFC] [PATCH] virtual memmap on sparsemem v3 [2/4] generic virtual mem_map on sparsemem
Date: Sat, 9 Dec 2006 13:05:47 +0100 [thread overview]
Message-ID: <20061209120547.GB10380@osiris.ibm.com> (raw)
In-Reply-To: <20061208160454.33fedd3f.kamezawa.hiroyu@jp.fujitsu.com>
> +#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 ?
next prev parent reply other threads:[~2006-12-09 12:05 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-08 6:56 [RFC] [PATCH] virtual memmap on sparsemem v3 [0/4] introduction KAMEZAWA Hiroyuki
2006-12-08 7:01 ` [RFC] [PATCH] virtual memmap on sparsemem v3 [1/4] map and unmap KAMEZAWA Hiroyuki
2006-12-09 0:28 ` Andrew Morton
2006-12-09 2:43 ` KAMEZAWA Hiroyuki
2006-12-09 4:52 ` KAMEZAWA Hiroyuki
2006-12-08 7:04 ` [RFC] [PATCH] virtual memmap on sparsemem v3 [2/4] generic virtual mem_map on sparsemem KAMEZAWA Hiroyuki
2006-12-09 12:05 ` Heiko Carstens [this message]
2006-12-09 13:17 ` KAMEZAWA Hiroyuki
2006-12-11 6:44 ` KAMEZAWA Hiroyuki
2006-12-08 7:07 ` [RFC] [PATCH] virtual memmap on sparsemem v3 [3/4] static virtual mem_map KAMEZAWA Hiroyuki
2006-12-09 0:30 ` Andrew Morton
2006-12-09 2:49 ` KAMEZAWA Hiroyuki
2006-12-09 3:33 ` Andrew Morton
2006-12-09 3:41 ` KAMEZAWA Hiroyuki
2006-12-09 4:53 ` KAMEZAWA Hiroyuki
2006-12-08 7:08 ` [RFC] [PATCH] virtual memmap on sparsemem v3 [4/4] ia64 support KAMEZAWA Hiroyuki
2006-12-09 4:55 ` KAMEZAWA Hiroyuki
2006-12-09 11:51 ` [RFC] [PATCH] virtual memmap on sparsemem v3 [0/4] introduction Heiko Carstens
2006-12-09 13:21 ` KAMEZAWA Hiroyuki
2006-12-10 19:47 ` Bob Picco
2006-12-11 0:43 ` KAMEZAWA Hiroyuki
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