Move vmalloc_to_page() to mm/vmalloc.

[linux-2.6-omap-h63xx.git] / mm / vmalloc.c

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index af77e171e339a357933d7eb6ba4b001efae5e390..e4c59a30835b422540ff54a3ffad26d11f159839 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -166,6 +166,44 @@ int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
 }
 EXPORT_SYMBOL_GPL(map_vm_area);
 
+/*
+ * Map a vmalloc()-space virtual address to the physical page.
+ */
+struct page *vmalloc_to_page(void *vmalloc_addr)
+{
+       unsigned long addr = (unsigned long) vmalloc_addr;
+       struct page *page = NULL;
+       pgd_t *pgd = pgd_offset_k(addr);
+       pud_t *pud;
+       pmd_t *pmd;
+       pte_t *ptep, pte;
+
+       if (!pgd_none(*pgd)) {
+               pud = pud_offset(pgd, addr);
+               if (!pud_none(*pud)) {
+                       pmd = pmd_offset(pud, addr);
+                       if (!pmd_none(*pmd)) {
+                               ptep = pte_offset_map(pmd, addr);
+                               pte = *ptep;
+                               if (pte_present(pte))
+                                       page = pte_page(pte);
+                               pte_unmap(ptep);
+                       }
+               }
+       }
+       return page;
+}
+EXPORT_SYMBOL(vmalloc_to_page);
+
+/*
+ * Map a vmalloc()-space virtual address to the physical page frame number.
+ */
+unsigned long vmalloc_to_pfn(void *vmalloc_addr)
+{
+       return page_to_pfn(vmalloc_to_page(vmalloc_addr));
+}
+EXPORT_SYMBOL(vmalloc_to_pfn);
+
 static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags,
                                            unsigned long start, unsigned long end,
                                            int node, gfp_t gfp_mask)