x86: PAT: add follow_pfnmp_pte routine to help tracking pfnmap pages - v3

[linux-2.6-omap-h63xx.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ffee2f74341856275ead62f71c6093c8de457199..a25024ff9c11966010e3ff647a555a09f1f2e7d6 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -145,6 +145,15 @@ extern pgprot_t protection_map[16];
 #define FAULT_FLAG_WRITE       0x01    /* Fault was a write access */
 #define FAULT_FLAG_NONLINEAR   0x02    /* Fault was via a nonlinear mapping */
 
+static inline int is_linear_pfn_mapping(struct vm_area_struct *vma)
+{
+       return ((vma->vm_flags & VM_PFNMAP) && vma->vm_pgoff);
+}
+
+static inline int is_pfn_mapping(struct vm_area_struct *vma)
+{
+       return (vma->vm_flags & VM_PFNMAP);
+}
 
 /*
  * vm_fault is filled by the the pagefault handler and passed to the vma's
@@ -1214,6 +1223,9 @@ struct page *follow_page(struct vm_area_struct *, unsigned long address,
 #define FOLL_GET       0x04    /* do get_page on page */
 #define FOLL_ANON      0x08    /* give ZERO_PAGE if no pgtable */
 
+int follow_pfnmap_pte(struct vm_area_struct *vma,
+                               unsigned long address, pte_t *ret_ptep);
+
 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
                        void *data);
 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,