From e70260aabea3af2a84b951e75166dcebe689b88e Mon Sep 17 00:00:00 2001 From: Yasunori Goto Date: Mon, 28 Apr 2008 02:13:32 -0700 Subject: [PATCH] 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 Cc: Badari Pulavarty Cc: Yinghai Lu Cc: Yasunori Goto Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/bootmem.h | 2 ++ mm/bootmem.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h index 4e4e340592..6a5dbdc8a7 100644 --- a/include/linux/bootmem.h +++ b/include/linux/bootmem.h @@ -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); #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE #define alloc_bootmem_node(pgdat, x) \ diff --git a/mm/bootmem.c b/mm/bootmem.c index 369624d278..e8fb927392 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 -- 2.39.5