Messages in this thread Patch in this message |  | | Date | Mon, 07 Apr 2008 21:47:29 +0900 | From | Yasunori Goto <> | Subject | [Patch 003/005](memory hotplug) make alloc_bootmem_section() |
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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>
--- include/linux/bootmem.h | 2 ++ mm/bootmem.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+)
Index: current/include/linux/bootmem.h =================================================================== --- current.orig/include/linux/bootmem.h 2008-04-07 19:18:44.000000000 +0900 +++ current/include/linux/bootmem.h 2008-04-07 19:30:08.000000000 +0900 @@ -101,6 +101,8 @@ 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); #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE #define alloc_bootmem_node(pgdat, x) \ Index: current/mm/bootmem.c =================================================================== --- current.orig/mm/bootmem.c 2008-04-07 19:18:44.000000000 +0900 +++ current/mm/bootmem.c 2008-04-07 19:30:08.000000000 +0900 @@ -540,6 +540,37 @@ 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 -- Yasunori Goto
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