diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1961056..a862a96 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -232,8 +232,8 @@
 }
 
 /* Support for virtually mapped pages */
-struct page *vmalloc_to_page(void *addr);
-unsigned long vmalloc_to_pfn(void *addr);
+struct page *vmalloc_to_page(const void *addr);
+unsigned long vmalloc_to_pfn(const void *addr);
 
 static inline struct page *compound_head(struct page *page)
 {
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 89338b4..ce8e7da 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -45,11 +45,11 @@
 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
 				pgprot_t prot);
-extern void vfree(void *addr);
+extern void vfree(const void *addr);
 
 extern void *vmap(struct page **pages, unsigned int count,
 			unsigned long flags, pgprot_t prot);
-extern void vunmap(void *addr);
+extern void vunmap(const void *addr);
 
 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 							unsigned long pgoff);
@@ -71,7 +71,7 @@
 extern struct vm_struct *get_vm_area_node(unsigned long size,
 					  unsigned long flags, int node,
 					  gfp_t gfp_mask);
-extern struct vm_struct *remove_vm_area(void *addr);
+extern struct vm_struct *remove_vm_area(const void *addr);
 
 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
 			struct page ***pages);
diff --git a/mm/nommu.c b/mm/nommu.c
index b989cb9..f3bfd01 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -167,7 +167,7 @@
 DEFINE_RWLOCK(vmlist_lock);
 struct vm_struct *vmlist;
 
-void vfree(void *addr)
+void vfree(const void *addr)
 {
 	kfree(addr);
 }
@@ -183,13 +183,13 @@
 }
 EXPORT_SYMBOL(__vmalloc);
 
-struct page * vmalloc_to_page(void *addr)
+struct page *vmalloc_to_page(const void *addr)
 {
 	return virt_to_page(addr);
 }
 EXPORT_SYMBOL(vmalloc_to_page);
 
-unsigned long vmalloc_to_pfn(void *addr)
+unsigned long vmalloc_to_pfn(const void *addr)
 {
 	return page_to_pfn(virt_to_page(addr));
 }
@@ -267,7 +267,7 @@
 }
 EXPORT_SYMBOL(vmap);
 
-void vunmap(void *addr)
+void vunmap(const void *addr)
 {
 	BUG();
 }
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index e4c59a3..21abac2 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -169,7 +169,7 @@
 /*
  * Map a vmalloc()-space virtual address to the physical page.
  */
-struct page *vmalloc_to_page(void *vmalloc_addr)
+struct page *vmalloc_to_page(const void *vmalloc_addr)
 {
 	unsigned long addr = (unsigned long) vmalloc_addr;
 	struct page *page = NULL;
@@ -198,7 +198,7 @@
 /*
  * Map a vmalloc()-space virtual address to the physical page frame number.
  */
-unsigned long vmalloc_to_pfn(void *vmalloc_addr)
+unsigned long vmalloc_to_pfn(const void *vmalloc_addr)
 {
 	return page_to_pfn(vmalloc_to_page(vmalloc_addr));
 }
@@ -306,7 +306,7 @@
 }
 
 /* Caller must hold vmlist_lock */
-static struct vm_struct *__find_vm_area(void *addr)
+static struct vm_struct *__find_vm_area(const void *addr)
 {
 	struct vm_struct *tmp;
 
@@ -319,7 +319,7 @@
 }
 
 /* Caller must hold vmlist_lock */
-static struct vm_struct *__remove_vm_area(void *addr)
+static struct vm_struct *__remove_vm_area(const void *addr)
 {
 	struct vm_struct **p, *tmp;
 
@@ -348,7 +348,7 @@
  *	This function returns the found VM area, but using it is NOT safe
  *	on SMP machines, except for its size or flags.
  */
-struct vm_struct *remove_vm_area(void *addr)
+struct vm_struct *remove_vm_area(const void *addr)
 {
 	struct vm_struct *v;
 	write_lock(&vmlist_lock);
@@ -357,7 +357,7 @@
 	return v;
 }
 
-static void __vunmap(void *addr, int deallocate_pages)
+static void __vunmap(const void *addr, int deallocate_pages)
 {
 	struct vm_struct *area;
 
@@ -408,7 +408,7 @@
  *
  *	Must not be called in interrupt context.
  */
-void vfree(void *addr)
+void vfree(const void *addr)
 {
 	BUG_ON(in_interrupt());
 	__vunmap(addr, 1);
@@ -424,7 +424,7 @@
  *
  *	Must not be called in interrupt context.
  */
-void vunmap(void *addr)
+void vunmap(const void *addr)
 {
 	BUG_ON(in_interrupt());
 	__vunmap(addr, 0);