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Subject[RFC] memory hotremove patch take 2 [08/10] (memap init alignment)

If there is small hole at end of a section, there are not initialized pages.
To find it, messy check is necessary at many place of memory remove code.
But, reserved bit by initialization is enough for most case of them.


Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>

mm/page_alloc.c | 5 +++++
1 files changed, 5 insertions(+)

Index: current_test/mm/page_alloc.c
===================================================================
--- current_test.orig/mm/page_alloc.c 2007-05-08 15:08:05.000000000 +0900
+++ current_test/mm/page_alloc.c 2007-05-08 15:08:08.000000000 +0900
@@ -2434,6 +2434,11 @@ void __meminit memmap_init_zone(unsigned
unsigned long end_pfn = start_pfn + size;
unsigned long pfn;

+
+#ifdef CONFIG_SPARSEMEM
+ end_pfn = roundup(end_pfn, PAGES_PER_SECTION);
+#endif
+
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
/*
* There can be holes in boot-time mem_map[]s
--
Yasunori Goto


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