--- include/linux/mm_types.h

+++ include/linux/mm_types.h

@@ -138,7 +138,7 @@ struct vm_area_struct {

within vm_mm. */

/* linked list of VM areas per task, sorted by address */

- struct vm_area_struct *vm_next;

+ struct vm_area_struct *vm_next, *vm_prev;

pgprot_t vm_page_prot; /* Access permissions of this VMA. */

unsigned long vm_flags; /* Flags, see mm.h. */