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>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 4e4e340592fb..6a5dbdc8a7dc 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -101,6 +101,8 @@ extern void reserve_bootmem_node(pg_data_t *pgdat,
 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) \