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x86: don't reallocate pgt for node0

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kva ram already mapped right after away, so don't need to get that for low ram.
avoid wasting one copy of pgdat.

also add node id in early_res name in case we get it from find_e820_area.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
2008-06-30 18:34:58 -07:00
committed by Ingo Molnar
parent 28bb223795
commit 996cf4438f
1 changed files with 7 additions and 4 deletions
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arch/x86/mm/discontig_32.c
+7 -4
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@@ -156,17 +156,20 @@ static void __init propagate_e820_map_node(int nid)
*/
static void __init allocate_pgdat(int nid)
{
if (nid && node_has_online_mem(nid) && node_remap_start_vaddr[nid])
char buf[16];
if (node_has_online_mem(nid) && node_remap_start_vaddr[nid])
NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
else {
unsigned long pgdat_phys;
pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
(nid ? max_low_pfn:max_pfn_mapped)<<PAGE_SHIFT,
max_pfn_mapped<<PAGE_SHIFT,
sizeof(pg_data_t),
PAGE_SIZE);
NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t),
"NODE_DATA");
memset(buf, 0, sizeof(buf));
sprintf(buf, "NODE_DATA %d", nid);
reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
}
printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
nid, (unsigned long)NODE_DATA(nid));