Commit e70260aa authored by Yasunori Goto's avatar Yasunori Goto Committed by Linus Torvalds
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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: default avatarYasunori Goto <>
Cc: Badari Pulavarty <>
Cc: Yinghai Lu <>
Cc: Yasunori Goto <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 9d99217a
......@@ -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);
#define alloc_bootmem_node(pgdat, x) \
......@@ -545,6 +545,37 @@ void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
return __alloc_bootmem(size, align, goal);
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,
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",
free_bootmem_core(pgdat->bdata, __pa(ptr), size);
ptr = NULL;
return ptr;
#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
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