diff --git a/mm/memory.c b/mm/memory.c
index 65962534b4ed0a3d207aa24b86bd0511a5d5bb38..92a3ebd8d7951daff767f409836c8490cf283028 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1227,7 +1227,12 @@ static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *pa
 	return retval;
 }
 
-/*
+/**
+ * vm_insert_page - insert single page into user vma
+ * @vma: user vma to map to
+ * @addr: target user address of this page
+ * @page: source kernel page
+ *
  * This allows drivers to insert individual pages they've allocated
  * into a user vma.
  *
@@ -1319,7 +1324,16 @@ static inline int remap_pud_range(struct mm_struct *mm, pgd_t *pgd,
 	return 0;
 }
 
-/*  Note: this is only safe if the mm semaphore is held when called. */
+/**
+ * remap_pfn_range - remap kernel memory to userspace
+ * @vma: user vma to map to
+ * @addr: target user address to start at
+ * @pfn: physical address of kernel memory
+ * @size: size of map area
+ * @prot: page protection flags for this mapping
+ *
+ *  Note: this is only safe if the mm semaphore is held when called.
+ */
 int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
 		    unsigned long pfn, unsigned long size, pgprot_t prot)
 {
@@ -1801,9 +1815,10 @@ void unmap_mapping_range(struct address_space *mapping,
 }
 EXPORT_SYMBOL(unmap_mapping_range);
 
-/*
- * Handle all mappings that got truncated by a "truncate()"
- * system call.
+/**
+ * vmtruncate - unmap mappings "freed" by truncate() syscall
+ * @inode: inode of the file used
+ * @offset: file offset to start truncating
  *
  * NOTE! We have to be ready to update the memory sharing
  * between the file and the memory map for a potential last
@@ -1872,11 +1887,16 @@ int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end)
 }
 EXPORT_UNUSED_SYMBOL(vmtruncate_range);  /*  June 2006  */
 
-/* 
+/**
+ * swapin_readahead - swap in pages in hope we need them soon
+ * @entry: swap entry of this memory
+ * @addr: address to start
+ * @vma: user vma this addresses belong to
+ *
  * Primitive swap readahead code. We simply read an aligned block of
  * (1 << page_cluster) entries in the swap area. This method is chosen
  * because it doesn't cost us any seek time.  We also make sure to queue
- * the 'original' request together with the readahead ones...  
+ * the 'original' request together with the readahead ones...
  *
  * This has been extended to use the NUMA policies from the mm triggering
  * the readahead.