mm: remove unused arg of set_page_dirty_balance()

commit ed6d7c8e upstream.

There's only one caller of set_page_dirty_balance() and that will call it
with page_mkwrite == 0.

The page_mkwrite argument was unused since commit b827e496 "mm: close
page_mkwrite races".
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

include/linux/writeback.h

@@ -190,7 +190,7 @@ int write_cache_pages(struct address_space *mapping,
 		      struct writeback_control *wbc, writepage_t writepage,
 		      void *data);
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
-void set_page_dirty_balance(struct page *page, int page_mkwrite);
+void set_page_dirty_balance(struct page *page);
 void writeback_set_ratelimit(void);
 void tag_pages_for_writeback(struct address_space *mapping,
 			     pgoff_t start, pgoff_t end);

mm/memory.c

@@ -2671,7 +2671,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		 */
 		if (!page_mkwrite) {
 			wait_on_page_locked(dirty_page);
-			set_page_dirty_balance(dirty_page, page_mkwrite);
+			set_page_dirty_balance(dirty_page);
 		}
 		put_page(dirty_page);
 		if (page_mkwrite) {

mm/page-writeback.c

@@ -1202,9 +1202,9 @@ static void balance_dirty_pages(struct address_space *mapping,
 		bdi_start_background_writeback(bdi);
 }
 
-void set_page_dirty_balance(struct page *page, int page_mkwrite)
+void set_page_dirty_balance(struct page *page)
 {
-	if (set_page_dirty(page) || page_mkwrite) {
+	if (set_page_dirty(page)) {
 		struct address_space *mapping = page_mapping(page);
 
 		if (mapping)