memory hotplug: small fixes to bootmem freeing for memory hotremove

- Change some naming
  * Magic -> types
  * MIX_INFO -> MIX_SECTION_INFO
  * Change definition of bootmem type from direct hex value

- __free_pages_bootmem() becomes __meminit.

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

include/linux/memory_hotplug.h

@@ -13,12 +13,12 @@ struct mem_section;
 #ifdef CONFIG_MEMORY_HOTPLUG
 
 /*
- * Magic number for free bootmem.
+ * Types for free bootmem.
  * The normal smallest mapcount is -1. Here is smaller value than it.
  */
-#define SECTION_INFO		0xfffffffe
-#define MIX_INFO		0xfffffffd
-#define NODE_INFO		0xfffffffc
+#define SECTION_INFO		(-1 - 1)
+#define MIX_SECTION_INFO	(-1 - 2)
+#define NODE_INFO		(-1 - 3)
 
 /*
  * pgdat resizing functions

mm/memory_hotplug.c

@@ -62,20 +62,20 @@ static void release_memory_resource(struct resource *res)
 
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 #ifndef CONFIG_SPARSEMEM_VMEMMAP
-static void get_page_bootmem(unsigned long info,  struct page *page, int magic)
+static void get_page_bootmem(unsigned long info,  struct page *page, int type)
 {
-	atomic_set(&page->_mapcount, magic);
+	atomic_set(&page->_mapcount, type);
 	SetPagePrivate(page);
 	set_page_private(page, info);
 	atomic_inc(&page->_count);
 }
 
 void put_page_bootmem(struct page *page)
 {
-	int magic;
+	int type;
 
-	magic = atomic_read(&page->_mapcount);
-	BUG_ON(magic >= -1);
+	type = atomic_read(&page->_mapcount);
+	BUG_ON(type >= -1);
 
 	if (atomic_dec_return(&page->_count) == 1) {
 		ClearPagePrivate(page);
@@ -119,7 +119,7 @@ static void register_page_bootmem_info_section(unsigned long start_pfn)
 	mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT;
 
 	for (i = 0; i < mapsize; i++, page++)
-		get_page_bootmem(section_nr, page, MIX_INFO);
+		get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
 
 }
 

mm/page_alloc.c

@@ -533,7 +533,7 @@ static void __free_pages_ok(struct page *page, unsigned int order)
 /*
  * permit the bootmem allocator to evade page validation on high-order frees
  */
-void __free_pages_bootmem(struct page *page, unsigned int order)
+void __meminit __free_pages_bootmem(struct page *page, unsigned int order)
 {
 	if (order == 0) {
 		__ClearPageReserved(page);