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Subject[PATCH 2/2] fix memmap init for handling memory hole
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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>
---
arch/ia64/mm/numa.c | 2 +-
include/linux/mmzone.h | 2 +-
mm/page_alloc.c | 23 ++++++++++++++++++++---
3 files changed, 22 insertions(+), 5 deletions(-)

Index: mmotm-2.6.29-Feb11/mm/page_alloc.c
===================================================================
--- mmotm-2.6.29-Feb11.orig/mm/page_alloc.c
+++ mmotm-2.6.29-Feb11/mm/page_alloc.c
@@ -2985,16 +2985,33 @@ int __meminit __early_pfn_to_nid(unsigne
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) \
Index: mmotm-2.6.29-Feb11/include/linux/mmzone.h
===================================================================
--- mmotm-2.6.29-Feb11.orig/include/linux/mmzone.h
+++ mmotm-2.6.29-Feb11/include/linux/mmzone.h
@@ -1079,7 +1079,7 @@ 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
Index: mmotm-2.6.29-Feb11/arch/ia64/mm/numa.c
===================================================================
--- mmotm-2.6.29-Feb11.orig/arch/ia64/mm/numa.c
+++ mmotm-2.6.29-Feb11/arch/ia64/mm/numa.c
@@ -70,7 +70,7 @@ int __meminit __early_pfn_to_nid(unsigne
return node_memblk[i].nid;
}

- return 0;
+ return -1;
}

#ifdef CONFIG_MEMORY_HOTPLUG


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