mm: rmap kernel-doc fixes

[sfrench/cifs-2.6.git] / mm / vmalloc.c

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 2e01af365848eb3d8485369d2fc4d9c4dad2a05c..ecf91f8034bf0e8cb2c3effb63609fd3c8405cdb 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)
@@ -216,6 +254,10 @@ static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long fl
                if (addr > end - size)
                        goto out;
        }
+       if ((size + addr) < addr)
+               goto out;
+       if (addr > end - size)
+               goto out;
 
 found:
        area->next = *p;
@@ -247,7 +289,7 @@ 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
  *
@@ -268,7 +310,7 @@ 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;
 
@@ -281,7 +323,7 @@ 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;
 
@@ -303,14 +345,14 @@ 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);
@@ -319,7 +361,7 @@ 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;
 
@@ -346,8 +388,10 @@ static void __vunmap(void *addr, int deallocate_pages)
                int i;
 
                for (i = 0; i < area->nr_pages; i++) {
-                       BUG_ON(!area->pages[i]);
-                       __free_page(area->pages[i]);
+                       struct page *page = area->pages[i];
+
+                       BUG_ON(!page);
+                       __free_page(page);
                }
 
                if (area->flags & VM_VPAGES)
@@ -364,13 +408,13 @@ 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);
@@ -386,7 +430,7 @@ 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);
@@ -423,8 +467,8 @@ void *vmap(struct page **pages, unsigned int count,
 }
 EXPORT_SYMBOL(vmap);
 
-void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
-                               pgprot_t prot, int node)
+static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
+                                pgprot_t prot, int node)
 {
        struct page **pages;
        unsigned int nr_pages, array_size, i;
@@ -451,15 +495,19 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
        }
 
        for (i = 0; i < area->nr_pages; i++) {
+               struct page *page;
+
                if (node < 0)
-                       area->pages[i] = alloc_page(gfp_mask);
+                       page = alloc_page(gfp_mask);
                else
-                       area->pages[i] = alloc_pages_node(node, gfp_mask, 0);
-               if (unlikely(!area->pages[i])) {
+                       page = alloc_pages_node(node, gfp_mask, 0);
+
+               if (unlikely(!page)) {
                        /* Successfully allocated i pages, free them in __vunmap() */
                        area->nr_pages = i;
                        goto fail;
                }
+               area->pages[i] = page;
        }
 
        if (map_vm_area(area, prot, &pages))
@@ -709,7 +757,8 @@ finished:
  *     @vma:           vma to cover (map full range of vma)
  *     @addr:          vmalloc memory
  *     @pgoff:         number of pages into addr before first page to map
- *     @returns:       0 for success, -Exxx on failure
+ *
+ *     Returns:        0 for success, -Exxx on failure
  *
  *     This function checks that addr is a valid vmalloc'ed area, and
  *     that it is big enough to cover the vma. Will return failure if
@@ -772,7 +821,7 @@ void  __attribute__((weak)) vmalloc_sync_all(void)
 }
 
 
-static int f(pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
+static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data)
 {
        /* apply_to_page_range() does all the hard work. */
        return 0;
@@ -781,7 +830,8 @@ static int f(pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
 /**
  *     alloc_vm_area - allocate a range of kernel address space
  *     @size:          size of the area
- *     @returns:       NULL on failure, vm_struct on success
+ *
+ *     Returns:        NULL on failure, vm_struct on success
  *
  *     This function reserves a range of kernel address space, and
  *     allocates pagetables to map that range.  No actual mappings