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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-02-18 14:48:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-18 15:37:55 -0800
commitcc2559bccc72767cb446f79b071d96c30c26439b (patch)
treeaacdeee5368e0eef72ed1d7a7cbd7e6ee4837941 /mm
parentf2dbcfa738368c8a40d4a5f0b65dc9879577cb21 (diff)
downloadlinux-2.6.38-lt-ux500-cc2559bccc72767cb446f79b071d96c30c26439b.tar.gz
mm: fix memmap init for handling memory hole
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c5dd74602ef..5c44ed49ca9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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) \