Merge branch 'sii-m15w' into upstream

[pandora-kernel.git] / arch / ia64 / mm / init.c

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 2f50c06..30617cc 100644 (file)
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -415,6 +415,61 @@ ia64_mmu_init (void *my_cpu_data)
 }
 
 #ifdef CONFIG_VIRTUAL_MEM_MAP
+int vmemmap_find_next_valid_pfn(int node, int i)
+{
+       unsigned long end_address, hole_next_pfn;
+       unsigned long stop_address;
+       pg_data_t *pgdat = NODE_DATA(node);
+
+       end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i];
+       end_address = PAGE_ALIGN(end_address);
+
+       stop_address = (unsigned long) &vmem_map[
+               pgdat->node_start_pfn + pgdat->node_spanned_pages];
+
+       do {
+               pgd_t *pgd;
+               pud_t *pud;
+               pmd_t *pmd;
+               pte_t *pte;
+
+               pgd = pgd_offset_k(end_address);
+               if (pgd_none(*pgd)) {
+                       end_address += PGDIR_SIZE;
+                       continue;
+               }
+
+               pud = pud_offset(pgd, end_address);
+               if (pud_none(*pud)) {
+                       end_address += PUD_SIZE;
+                       continue;
+               }
+
+               pmd = pmd_offset(pud, end_address);
+               if (pmd_none(*pmd)) {
+                       end_address += PMD_SIZE;
+                       continue;
+               }
+
+               pte = pte_offset_kernel(pmd, end_address);
+retry_pte:
+               if (pte_none(*pte)) {
+                       end_address += PAGE_SIZE;
+                       pte++;
+                       if ((end_address < stop_address) &&
+                           (end_address != ALIGN(end_address, 1UL << PMD_SHIFT)))
+                               goto retry_pte;
+                       continue;
+               }
+               /* Found next valid vmem_map page */
+               break;
+       } while (end_address < stop_address);
+
+       end_address = min(end_address, stop_address);
+       end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1;
+       hole_next_pfn = end_address / sizeof(struct page);
+       return hole_next_pfn - pgdat->node_start_pfn;
+}
 
 int __init
 create_mem_map_page_table (u64 start, u64 end, void *arg)