swap_info: miscellaneous minor cleanups

Move CONFIG_HIBERNATION's swapdev_block() into the main CONFIG_HIBERNATION
block, remove extraneous whitespace and return, fix typo in a comment.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 16de84b..fa5f10b 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -519,9 +519,9 @@ swp_entry_t get_swap_page_of_type(int type)
        return (swp_entry_t) {0};
 }
 
-static struct swap_info_struct * swap_info_get(swp_entry_t entry)
+static struct swap_info_struct *swap_info_get(swp_entry_t entry)
 {
-       struct swap_info_struct * p;
+       struct swap_info_struct *p;
        unsigned long offset, type;
 
        if (!entry.val)
@@ -599,7 +599,7 @@ static int swap_entry_free(struct swap_info_struct *p,
  */
 void swap_free(swp_entry_t entry)
 {
-       struct swap_info_struct * p;
+       struct swap_info_struct *p;
 
        p = swap_info_get(entry);
        if (p) {
@@ -629,7 +629,6 @@ void swapcache_free(swp_entry_t entry, struct page *page)
                }
                spin_unlock(&swap_lock);
        }
-       return;
 }
 
 /*
@@ -783,6 +782,21 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p)
 }
 
 /*
+ * Get the (PAGE_SIZE) block corresponding to given offset on the swapdev
+ * corresponding to given index in swap_info (swap type).
+ */
+sector_t swapdev_block(int type, pgoff_t offset)
+{
+       struct block_device *bdev;
+
+       if ((unsigned int)type >= nr_swapfiles)
+               return 0;
+       if (!(swap_info[type]->flags & SWP_WRITEOK))
+               return 0;
+       return map_swap_page(swp_entry(type, offset), &bdev);
+}
+
+/*
  * Return either the total number of swap pages of given type, or the number
  * of free pages of that type (depending on @free)
  *
@@ -805,7 +819,7 @@ unsigned int count_swap_pages(int type, int free)
        spin_unlock(&swap_lock);
        return n;
 }
-#endif
+#endif /* CONFIG_HIBERNATION */
 
 /*
  * No need to decide whether this PTE shares the swap entry with others,
@@ -1316,23 +1330,6 @@ sector_t map_swap_page(swp_entry_t entry, struct block_device **bdev)
        }
 }
 
-#ifdef CONFIG_HIBERNATION
-/*
- * Get the (PAGE_SIZE) block corresponding to given offset on the swapdev
- * corresponding to given index in swap_info (swap type).
- */
-sector_t swapdev_block(int type, pgoff_t offset)
-{
-       struct block_device *bdev;
-
-       if ((unsigned int)type >= nr_swapfiles)
-               return 0;
-       if (!(swap_info[type]->flags & SWP_WRITEOK))
-               return 0;
-       return map_swap_page(swp_entry(type, offset), &bdev);
-}
-#endif /* CONFIG_HIBERNATION */
-
 /*
  * Free all of a swapdev's extent information
  */
@@ -1523,12 +1520,12 @@ bad_bmap:
 
 SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
 {
-       struct swap_info_struct * p = NULL;
+       struct swap_info_struct *p = NULL;
        unsigned short *swap_map;
        struct file *swap_file, *victim;
        struct address_space *mapping;
        struct inode *inode;
-       char * pathname;
+       char *pathname;
        int i, type, prev;
        int err;
 
@@ -1780,7 +1777,7 @@ late_initcall(max_swapfiles_check);
  */
 SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 {
-       struct swap_info_struct * p;
+       struct swap_info_struct *p;
        char *name = NULL;
        struct block_device *bdev = NULL;
        struct file *swap_file = NULL;
@@ -2116,7 +2113,7 @@ void si_swapinfo(struct sysinfo *val)
  */
 static int __swap_duplicate(swp_entry_t entry, bool cache)
 {
-       struct swap_info_struct * p;
+       struct swap_info_struct *p;
        unsigned long offset, type;
        int result = -EINVAL;
        int count;
@@ -2185,7 +2182,7 @@ void swap_duplicate(swp_entry_t entry)
 /*
  * @entry: swap entry for which we allocate swap cache.
  *
- * Called when allocating swap cache for exising swap entry,
+ * Called when allocating swap cache for existing swap entry,
  * This can return error codes. Returns 0 at success.
  * -EBUSY means there is a swap cache.
  * Note: return code is different from swap_duplicate().