diff options
| -rw-r--r-- | include/linux/mmzone.h | 6 | ||||
| -rw-r--r-- | mm/sparse.c | 54 |
2 files changed, 55 insertions, 5 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index a8140a9a65e8..9a5d5590bd39 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -748,7 +748,7 @@ extern struct zone *next_zone(struct zone *zone); #define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1)) #define SECTION_BLOCKFLAGS_BITS \ - ((SECTION_SIZE_BITS - (MAX_ORDER-1)) * NR_PAGEBLOCK_BITS) + ((1 << (PFN_SECTION_SHIFT - (MAX_ORDER-1))) * NR_PAGEBLOCK_BITS) #if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS #error Allocator MAX_ORDER exceeds SECTION_SIZE @@ -769,7 +769,9 @@ struct mem_section { * before using it wrong. */ unsigned long section_mem_map; - DECLARE_BITMAP(pageblock_flags, SECTION_BLOCKFLAGS_BITS); + + /* See declaration of similar field in struct zone */ + unsigned long *pageblock_flags; }; #ifdef CONFIG_SPARSEMEM_EXTREME diff --git a/mm/sparse.c b/mm/sparse.c index 52843a76feed..1f4dbb867b8a 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -206,7 +206,8 @@ struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pn } static int __meminit sparse_init_one_section(struct mem_section *ms, - unsigned long pnum, struct page *mem_map) + unsigned long pnum, struct page *mem_map, + unsigned long *pageblock_bitmap) { if (!present_section(ms)) return -EINVAL; @@ -214,6 +215,7 @@ static int __meminit sparse_init_one_section(struct mem_section *ms, ms->section_mem_map &= ~SECTION_MAP_MASK; ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | SECTION_HAS_MEM_MAP; + ms->pageblock_flags = pageblock_bitmap; return 1; } @@ -224,6 +226,38 @@ void *alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size) return NULL; } +static unsigned long usemap_size(void) +{ + unsigned long size_bytes; + size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8; + size_bytes = roundup(size_bytes, sizeof(unsigned long)); + return size_bytes; +} + +#ifdef CONFIG_MEMORY_HOTPLUG +static unsigned long *__kmalloc_section_usemap(void) +{ + return kmalloc(usemap_size(), GFP_KERNEL); +} +#endif /* CONFIG_MEMORY_HOTPLUG */ + +static unsigned long *sparse_early_usemap_alloc(unsigned long pnum) +{ + unsigned long *usemap; + struct mem_section *ms = __nr_to_section(pnum); + int nid = sparse_early_nid(ms); + + usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size()); + if (usemap) + return usemap; + + /* Stupid: suppress gcc warning for SPARSEMEM && !NUMA */ + nid = 0; + + printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__); + return NULL; +} + #ifndef CONFIG_SPARSEMEM_VMEMMAP struct page __init *sparse_early_mem_map_populate(unsigned long pnum, int nid) { @@ -268,6 +302,7 @@ void __init sparse_init(void) { unsigned long pnum; struct page *map; + unsigned long *usemap; for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { if (!present_section_nr(pnum)) @@ -276,7 +311,13 @@ void __init sparse_init(void) map = sparse_early_mem_map_alloc(pnum); if (!map) continue; - sparse_init_one_section(__nr_to_section(pnum), pnum, map); + + usemap = sparse_early_usemap_alloc(pnum); + if (!usemap) + continue; + + sparse_init_one_section(__nr_to_section(pnum), pnum, map, + usemap); } } @@ -332,6 +373,7 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, struct pglist_data *pgdat = zone->zone_pgdat; struct mem_section *ms; struct page *memmap; + unsigned long *usemap; unsigned long flags; int ret; @@ -341,6 +383,7 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, */ sparse_index_init(section_nr, pgdat->node_id); memmap = __kmalloc_section_memmap(nr_pages); + usemap = __kmalloc_section_usemap(); pgdat_resize_lock(pgdat, &flags); @@ -349,9 +392,14 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, ret = -EEXIST; goto out; } + + if (!usemap) { + ret = -ENOMEM; + goto out; + } ms->section_mem_map |= SECTION_MARKED_PRESENT; - ret = sparse_init_one_section(ms, section_nr, memmap); + ret = sparse_init_one_section(ms, section_nr, memmap, usemap); out: pgdat_resize_unlock(pgdat, &flags); |