diff options
Diffstat (limited to 'arch/x86/mm/init_64.c')
| -rw-r--r-- | arch/x86/mm/init_64.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 458893b376f..7d4fc633a9c 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -748,3 +748,48 @@ const char *arch_vma_name(struct vm_area_struct *vma) return "[vsyscall]"; return NULL; } + +#ifdef CONFIG_SPARSEMEM_VMEMMAP +/* + * Initialise the sparsemem vmemmap using huge-pages at the PMD level. + */ +int __meminit vmemmap_populate(struct page *start_page, + unsigned long size, int node) +{ + unsigned long addr = (unsigned long)start_page; + unsigned long end = (unsigned long)(start_page + size); + unsigned long next; + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + + for (; addr < end; addr = next) { + next = pmd_addr_end(addr, end); + + pgd = vmemmap_pgd_populate(addr, node); + if (!pgd) + return -ENOMEM; + pud = vmemmap_pud_populate(pgd, addr, node); + if (!pud) + return -ENOMEM; + + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) { + pte_t entry; + void *p = vmemmap_alloc_block(PMD_SIZE, node); + if (!p) + return -ENOMEM; + + entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL); + mk_pte_huge(entry); + set_pmd(pmd, __pmd(pte_val(entry))); + + printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n", + addr, addr + PMD_SIZE - 1, p, node); + } else + vmemmap_verify((pte_t *)pmd, node, addr, next); + } + + return 0; +} +#endif |