It's used to pass the size of map data unit into alloc_usemap_and_memmap,
and is preparation for next patch.
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
---
mm/sparse.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/mm/sparse.c b/mm/sparse.c
index 3d697292be08..4a58f8809542 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -491,10 +491,12 @@ void __weak __meminit vmemmap_populate_print_last(void)
/**
* alloc_usemap_and_memmap - memory alloction for pageblock flags and vmemmap
* @map: usemap_map for pageblock flags or mmap_map for vmemmap
+ * @unit_size: size of map unit
*/
static void __init alloc_usemap_and_memmap(void (*alloc_func)
(void *, unsigned long, unsigned long,
- unsigned long, int), void *data)
+ unsigned long, int), void *data,
+ int data_unit_size)
{
unsigned long pnum;
unsigned long map_count;
@@ -571,7 +573,8 @@ void __init sparse_init(void)
if (!usemap_map)
panic("can not allocate usemap_map\n");
alloc_usemap_and_memmap(sparse_early_usemaps_alloc_node,
- (void *)usemap_map);
+ (void *)usemap_map,
+ sizeof(usemap_map[0]));
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
size2 = sizeof(struct page *) * NR_MEM_SECTIONS;
@@ -579,7 +582,8 @@ void __init sparse_init(void)
if (!map_map)
panic("can not allocate map_map\n");
alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node,
- (void *)map_map);
+ (void *)map_map,
+ sizeof(map_map[0]));
#endif
for_each_present_section_nr(0, pnum) {
--
2.13.6
