From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: linux-mm@kvack.org, clameter@engr.sgi.com, apw@shadowen.org
Subject: Re: [RFC][PATCH] vmemmap on sparsemem v2 [1/5] generic vmemmap on sparsemem
Date: Wed, 6 Dec 2006 19:13:17 +0100 [thread overview]
Message-ID: <20061206181317.GA10042@osiris.ibm.com> (raw)
In-Reply-To: <20061205214902.b8454d67.kamezawa.hiroyu@jp.fujitsu.com>
> We can assume that total size of mem_map per section is aligned to PAGE_SIZE.
[...]
> +static int __meminit map_virtual_mem_map(unsigned long section, int node)
> +{
> + unsigned long vmap_start, vmap_end, vmap;
> + void *pg;
> + pgd_t *pgd;
> + pud_t *pud;
> + pmd_t *pmd;
> + pte_t *pte;
> +
> + vmap_start = (unsigned long)pfn_to_page(section_nr_to_pfn(section));
> + vmap_end = vmap_start + PAGES_PER_SECTION * sizeof(struct page);
> +
> + for (vmap = vmap_start;
> + vmap != vmap_end;
> + vmap += PAGE_SIZE)
> + {
Hmm.. maybe I'm just too tired. But why does this work? Why is vmap_start
PAGE_SIZE aligned and why is vmap_end PAGE_SIZE aligned too?
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next prev parent reply other threads:[~2006-12-06 18:13 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-05 12:45 [RFC][PATCH] vmemmap on sparsemem v2 KAMEZAWA Hiroyuki
2006-12-05 12:49 ` [RFC][PATCH] vmemmap on sparsemem v2 [1/5] generic vmemmap on sparsemem KAMEZAWA Hiroyuki
2006-12-06 18:13 ` Heiko Carstens [this message]
2006-12-06 18:17 ` Christoph Lameter
2006-12-07 0:20 ` KAMEZAWA Hiroyuki
2006-12-07 0:20 ` Christoph Lameter
2006-12-07 10:11 ` Heiko Carstens
2006-12-07 10:50 ` KAMEZAWA Hiroyuki
2006-12-07 10:06 ` Heiko Carstens
2006-12-07 10:17 ` KAMEZAWA Hiroyuki
2006-12-08 3:06 ` KAMEZAWA Hiroyuki
2006-12-05 12:53 ` [RFC][PATCH] vmemmap on sparsemem v2 [2/5] memory hotplug support KAMEZAWA Hiroyuki
2006-12-05 12:59 ` [RFC][PATCH] vmemmap on sparsemem v2 [3/5] ia64 vmemamp on sparsemem KAMEZAWA Hiroyuki
2006-12-08 1:09 ` KAMEZAWA Hiroyuki
2006-12-05 13:09 ` [RFC][PATCH] vmemmap on sparsemem v2 [4/5] optimized pfn_valid KAMEZAWA Hiroyuki
2006-12-05 13:10 ` [RFC][PATCH] vmemmap on sparsemem v2 [5/5] optimzied pfn_valid support for ia64 KAMEZAWA Hiroyuki
2006-12-10 13:37 ` [RFC][PATCH] vmemmap on sparsemem v2 Andy Whitcroft
2006-12-10 15:19 ` Heiko Carstens
2006-12-11 1:09 ` KAMEZAWA Hiroyuki
2006-12-11 17:23 ` Christoph Lameter
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