diff options
| author | Yasunori Goto <y-goto@jp.fujitsu.com> | 2008-04-28 02:13:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:25 -0700 |
| commit | e70260aabea3af2a84b951e75166dcebe689b88e (patch) | |
| tree | 196dc5f2804f9f5496f51954330a036e3a2762d8 /mm/bootmem.c | |
| parent | 9d99217a02a06a7cc83f065b73e976970970c58c (diff) | |
| download | lwn-e70260aabea3af2a84b951e75166dcebe689b88e.tar.gz lwn-e70260aabea3af2a84b951e75166dcebe689b88e.zip | |
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: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/bootmem.c')
| -rw-r--r-- | mm/bootmem.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c index 369624d2789c..e8fb927392b9 100644 --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -545,6 +545,37 @@ void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, return __alloc_bootmem(size, align, goal); } +#ifdef CONFIG_SPARSEMEM +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, + limit); + + 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", + section_nr); + free_bootmem_core(pgdat->bdata, __pa(ptr), size); + ptr = NULL; + } + + return ptr; +} +#endif + #ifndef ARCH_LOW_ADDRESS_LIMIT #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL #endif |