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Subject[Patch 003/005](memory hotplug) make alloc_bootmem_section()

alloc_bootmem_section() can allocate specified section's area.
This is used for usemap to keep same section with pgdat by later patch.

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

---
include/linux/bootmem.h | 2 ++
mm/bootmem.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+)

Index: current/include/linux/bootmem.h
===================================================================
--- current.orig/include/linux/bootmem.h 2008-04-07 19:18:44.000000000 +0900
+++ current/include/linux/bootmem.h 2008-04-07 19:30:08.000000000 +0900
@@ -101,6 +101,8 @@
extern void free_bootmem_node(pg_data_t *pgdat,
unsigned long addr,
unsigned long size);
+extern void *alloc_bootmem_section(unsigned long size,
+ unsigned long section_nr);

#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
#define alloc_bootmem_node(pgdat, x) \
Index: current/mm/bootmem.c
===================================================================
--- current.orig/mm/bootmem.c 2008-04-07 19:18:44.000000000 +0900
+++ current/mm/bootmem.c 2008-04-07 19:30:08.000000000 +0900
@@ -540,6 +540,37 @@
return __alloc_bootmem(size, align, goal);
}

+#ifdef CONFIG_SPARSEMEM
+void * __init alloc_bootmem_section(unsigned long size,
+ unsigned long section_nr)
+{
+ void *ptr;
+ unsigned long limit, goal, start_nr, end_nr, pfn;
+ struct pglist_data *pgdat;
+
+ pfn = section_nr_to_pfn(section_nr);
+ goal = PFN_PHYS(pfn);
+ limit = PFN_PHYS(section_nr_to_pfn(section_nr + 1)) - 1;
+ pgdat = NODE_DATA(early_pfn_to_nid(pfn));
+ ptr = __alloc_bootmem_core(pgdat->bdata, size, SMP_CACHE_BYTES, goal,
+ limit);
+
+ if (!ptr)
+ return NULL;
+
+ start_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr)));
+ end_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr) + size));
+ if (start_nr != section_nr || end_nr != section_nr) {
+ printk(KERN_WARNING "alloc_bootmem failed on section %ld.\n",
+ section_nr);
+ free_bootmem_core(pgdat->bdata, __pa(ptr), size);
+ ptr = NULL;
+ }
+
+ return ptr;
+}
+#endif
+
#ifndef ARCH_LOW_ADDRESS_LIMIT
#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
#endif
--
Yasunori Goto




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