[PATCH] memory hotplug: move section_mem_map alloc to sparse.c

This basically keeps up from having to extern __kmalloc_section_memmap().

The vaddr_in_vmalloc_area() helper could go in a vmalloc header, but that
header gets hard to work with, because it needs some arch-specific macros.
Just stick it in here for now, instead of creating another header.

Signed-off-by: Dave Hansen <[e-mail]>
Signed-off-by: Lion Vollnhals <[e-mail]>
Signed-off-by: Jiri Slaby <[e-mail]>
Signed-off-by: Yasunori Goto <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/acpi/acpi_memhotplug.c

···
 	 * Note: Assume that this function returns zero on success
 	 */
 	result = add_memory(mem_device->start_addr,
-			    (mem_device->end_addr - mem_device->start_addr) + 1,
-			    mem_device->read_write_attribute);
+			    (mem_device->end_addr - mem_device->start_addr) + 1);
 	if (result) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "\nadd_memory failed\n"));
 		mem_device->state = MEMORY_INVALID_STATE;
···
 	 * Ask the VM to offline this memory range.
 	 * Note: Assume that this function returns zero on success
 	 */
-	result = remove_memory(start, len, attr);
+	result = remove_memory(start, len);
 	if (result) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Hot-Remove failed.\n"));
 		return_VALUE(result);

drivers/base/memory.c

···
 static int add_memory_block(unsigned long node_id, struct mem_section *section,
 		     unsigned long state, int phys_device)
 {
-	size_t size = sizeof(struct memory_block);
-	struct memory_block *mem = kmalloc(size, GFP_KERNEL);
+	struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL);
 	int ret = 0;
 
 	if (!mem)
 		return -ENOMEM;
-
-	memset(mem, 0, size);
 
 	mem->phys_index = __section_nr(section);
 	mem->state = state;

mm/memory_hotplug.c

···
 
 #include <asm/tlbflush.h>
 
-static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
-{
-	struct page *page, *ret;
-	unsigned long memmap_size = sizeof(struct page) * nr_pages;
-
-	page = alloc_pages(GFP_KERNEL, get_order(memmap_size));
-	if (page)
-		goto got_map_page;
-
-	ret = vmalloc(memmap_size);
-	if (ret)
-		goto got_map_ptr;
-
-	return NULL;
-got_map_page:
-	ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
-got_map_ptr:
-	memset(ret, 0, memmap_size);
-
-	return ret;
-}
-
 extern void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn,
 			  unsigned long size);
 static void __add_zone(struct zone *zone, unsigned long phys_start_pfn)
···
 	zonetable_add(zone, nid, zone_type, phys_start_pfn, nr_pages);
 }
 
-extern int sparse_add_one_section(struct zone *, unsigned long,
-				  struct page *mem_map);
+extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
+				  int nr_pages);
 static int __add_section(struct zone *zone, unsigned long phys_start_pfn)
 {
 	struct pglist_data *pgdat = zone->zone_pgdat;
 	int nr_pages = PAGES_PER_SECTION;
-	struct page *memmap;
 	int ret;
 
-	/*
-	 * This can potentially allocate memory, and does its own
-	 * internal locking.
-	 */
-	sparse_index_init(pfn_to_section_nr(phys_start_pfn), pgdat->node_id);
-
-	pgdat_resize_lock(pgdat, &flags);
-	memmap = __kmalloc_section_memmap(nr_pages);
-	ret = sparse_add_one_section(zone, phys_start_pfn, memmap);
-	pgdat_resize_unlock(pgdat, &flags);
-
-	if (ret <= 0) {
-		/* the mem_map didn't get used */
-		if (memmap >= (struct page *)VMALLOC_START &&
-		    memmap < (struct page *)VMALLOC_END)
-			vfree(memmap);
-		else
-			free_pages((unsigned long)memmap,
-				   get_order(sizeof(struct page) * nr_pages));
-	}
+	ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
 
 	if (ret < 0)
 		return ret;

mm/sparse.c

···
 #include <linux/mm.h>
 #include <linux/mmzone.h>
 #include <linux/bootmem.h>
+#include <linux/highmem.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
+#include <linux/vmalloc.h>
 #include <asm/dma.h>
 
 /*
···
 	return NULL;
 }
 
+static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
+{
+	struct page *page, *ret;
+	unsigned long memmap_size = sizeof(struct page) * nr_pages;
+
+	page = alloc_pages(GFP_KERNEL, get_order(memmap_size));
+	if (page)
+		goto got_map_page;
+
+	ret = vmalloc(memmap_size);
+	if (ret)
+		goto got_map_ptr;
+
+	return NULL;
+got_map_page:
+	ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
+got_map_ptr:
+	memset(ret, 0, memmap_size);
+
+	return ret;
+}
+
+static int vaddr_in_vmalloc_area(void *addr)
+{
+	if (addr >= (void *)VMALLOC_START &&
+	    addr < (void *)VMALLOC_END)
+		return 1;
+	return 0;
+}
+
+static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
+{
+	if (vaddr_in_vmalloc_area(memmap))
+		vfree(memmap);
+	else
+		free_pages((unsigned long)memmap,
+			   get_order(sizeof(struct page) * nr_pages));
+}
+
 /*
  * Allocate the accumulated non-linear sections, allocate a mem_map
  * for each and record the physical to section mapping.
···
  * set.  If this is <=0, then that means that the passed-in
  * map was not consumed and must be freed.
  */
-int sparse_add_one_section(unsigned long start_pfn, int nr_pages, struct page *map)
+int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
+			   int nr_pages)
 {
-	struct mem_section *ms = __pfn_to_section(start_pfn);
+	unsigned long section_nr = pfn_to_section_nr(start_pfn);
+	struct pglist_data *pgdat = zone->zone_pgdat;
+	struct mem_section *ms;
+	struct page *memmap;
+	unsigned long flags;
+	int ret;
 
-	if (ms->section_mem_map & SECTION_MARKED_PRESENT)
-		return -EEXIST;
+	/*
+	 * no locking for this, because it does its own
+	 * plus, it does a kmalloc
+	 */
+	sparse_index_init(section_nr, pgdat->node_id);
+	memmap = __kmalloc_section_memmap(nr_pages);
 
+	pgdat_resize_lock(pgdat, &flags);
+
+	ms = __pfn_to_section(start_pfn);
+	if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
+		ret = -EEXIST;
+		goto out;
+	}
 	ms->section_mem_map |= SECTION_MARKED_PRESENT;
 
-	return sparse_init_one_section(ms, pfn_to_section_nr(start_pfn), map);
+	ret = sparse_init_one_section(ms, section_nr, memmap);
+
+	if (ret <= 0)
+		__kfree_section_memmap(memmap, nr_pages);
+out:
+	pgdat_resize_unlock(pgdat, &flags);
+	return ret;
 }