vmalloc: add const to void* parameters

[powerpc.git] / mm / vmalloc.c

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3cee76a..21abac2 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(const 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(const 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)
@@ -190,7 +228,8 @@ static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long fl
        if (unlikely(!size))
                return NULL;
 
-       area = kmalloc_node(sizeof(*area), gfp_mask & GFP_LEVEL_MASK, node);
+       area = kmalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);
+
        if (unlikely(!area))
                return NULL;
 
@@ -246,7 +285,7 @@ struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 EXPORT_SYMBOL_GPL(__get_vm_area);
 
 /**
- *     get_vm_area  -  reserve a contingous kernel virtual area
+ *     get_vm_area  -  reserve a contiguous kernel virtual area
  *     @size:          size of the area
  *     @flags:         %VM_IOREMAP for I/O mappings or VM_ALLOC
  *
@@ -267,7 +306,7 @@ struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags,
 }
 
 /* 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;
 
@@ -280,7 +319,7 @@ static struct vm_struct *__find_vm_area(void *addr)
 }
 
 /* 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;
 
@@ -302,14 +341,14 @@ found:
 }
 
 /**
- *     remove_vm_area  -  find and remove a contingous kernel virtual area
+ *     remove_vm_area  -  find and remove a continuous kernel virtual area
  *     @addr:          base address
  *
  *     Search for the kernel VM area starting at @addr, and remove it.
  *     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);
@@ -318,7 +357,7 @@ struct vm_struct *remove_vm_area(void *addr)
        return v;
 }
 
-static void __vunmap(void *addr, int deallocate_pages)
+static void __vunmap(const void *addr, int deallocate_pages)
 {
        struct vm_struct *area;
 
@@ -363,13 +402,13 @@ static void __vunmap(void *addr, int deallocate_pages)
  *     vfree  -  release memory allocated by vmalloc()
  *     @addr:          memory base address
  *
- *     Free the virtually contiguous memory area starting at @addr, as
+ *     Free the virtually continuous memory area starting at @addr, as
  *     obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is
  *     NULL, no operation is performed.
  *
  *     Must not be called in interrupt context.
  */
-void vfree(void *addr)
+void vfree(const void *addr)
 {
        BUG_ON(in_interrupt());
        __vunmap(addr, 1);
@@ -385,7 +424,7 @@ EXPORT_SYMBOL(vfree);
  *
  *     Must not be called in interrupt context.
  */
-void vunmap(void *addr)
+void vunmap(const void *addr)
 {
        BUG_ON(in_interrupt());
        __vunmap(addr, 0);
@@ -439,7 +478,7 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
                area->flags |= VM_VPAGES;
        } else {
                pages = kmalloc_node(array_size,
-                               (gfp_mask & GFP_LEVEL_MASK) | __GFP_ZERO,
+                               (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO,
                                node);
        }
        area->pages = pages;