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mm: fix memmap init for handling memory hole

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Now, early_pfn_in_nid(PFN, NID) may returns false if PFN is a hole.
and memmap initialization was not done. This was a trouble for
sparc boot.

To fix this, the PFN should be initialized and marked as PG_reserved.
This patch changes early_pfn_in_nid() return true if PFN is a hole.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reported-by: David Miller <davem@davemlloft.net>
Tested-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: <stable@kernel.org>		[2.6.25.x, 2.6.26.x, 2.6.27.x, 2.6.28.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-02-18 14:48:33 -08:00 committed by Linus Torvalds
parent f2dbcfa738
commit cc2559bccc
3 changed files with 22 additions and 5 deletions
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2
arch/ia64/mm/numa.c
View File

@ -70,7 +70,7 @@ int __meminit __early_pfn_to_nid(unsigned long pfn)
return node_memblk[i].nid;
}
return 0;
return -1;
}
#ifdef CONFIG_MEMORY_HOTPLUG

2
include/linux/mmzone.h
View File

@ -1071,7 +1071,7 @@ void sparse_init(void);
#endif /* CONFIG_SPARSEMEM */
#ifdef CONFIG_NODES_SPAN_OTHER_NODES
#define early_pfn_in_nid(pfn, nid) (early_pfn_to_nid(pfn) == (nid))
bool early_pfn_in_nid(unsigned long pfn, int nid);
#else
#define early_pfn_in_nid(pfn, nid) (1)
#endif

23
mm/page_alloc.c
View File

@ -3000,16 +3000,33 @@ int __meminit __early_pfn_to_nid(unsigned long pfn)
if (start_pfn <= pfn && pfn < end_pfn)
return early_node_map[i].nid;
}
return 0;
/* This is a memory hole */
return -1;
}
#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
int __meminit early_pfn_to_nid(unsigned long pfn)
{
return __early_pfn_to_nid(pfn);
int nid;
nid = __early_pfn_to_nid(pfn);
if (nid >= 0)
return nid;
/* just returns 0 */
return 0;
}
#ifdef CONFIG_NODES_SPAN_OTHER_NODES
bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
{
int nid;
nid = __early_pfn_to_nid(pfn);
if (nid >= 0 && nid != node)
return false;
return true;
}
#endif
/* Basic iterator support to walk early_node_map[] */
#define for_each_active_range_index_in_nid(i, nid) \