diff options
Diffstat (limited to 'mm/sparse.c')
| -rw-r--r-- | mm/sparse.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/mm/sparse.c b/mm/sparse.c index 5032c9a619de..9d7fd666015e 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -222,7 +222,8 @@ void __init memory_present(int nid, unsigned long start, unsigned long end) ms = __nr_to_section(section); if (!ms->section_mem_map) { - ms->section_mem_map = sparse_encode_early_nid(nid); + ms->section_mem_map = sparse_encode_early_nid(nid) | + SECTION_IS_ONLINE; section_mark_present(ms); } } @@ -622,6 +623,48 @@ void __init sparse_init(void) } #ifdef CONFIG_MEMORY_HOTPLUG + +/* Mark all memory sections within the pfn range as online */ +void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn) +{ + unsigned long pfn; + + for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { + unsigned long section_nr = pfn_to_section_nr(start_pfn); + struct mem_section *ms; + + /* onlining code should never touch invalid ranges */ + if (WARN_ON(!valid_section_nr(section_nr))) + continue; + + ms = __nr_to_section(section_nr); + ms->section_mem_map |= SECTION_IS_ONLINE; + } +} + +#ifdef CONFIG_MEMORY_HOTREMOVE +/* Mark all memory sections within the pfn range as online */ +void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) +{ + unsigned long pfn; + + for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { + unsigned long section_nr = pfn_to_section_nr(start_pfn); + struct mem_section *ms; + + /* + * TODO this needs some double checking. Offlining code makes + * sure to check pfn_valid but those checks might be just bogus + */ + if (WARN_ON(!valid_section_nr(section_nr))) + continue; + + ms = __nr_to_section(section_nr); + ms->section_mem_map &= ~SECTION_IS_ONLINE; + } +} +#endif + #ifdef CONFIG_SPARSEMEM_VMEMMAP static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid) { |