[dm-devel] [PATCH 1/4] brd: make brd_insert_page return bool

[Mikulas Patocka]

brd_insert_page returns a pointer to struct page, however the pointer is
never used (it is only compared against NULL), so to clean-up the code, we
make it return bool.

Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>

---
 drivers/block/brd.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

Index: linux-2.6/drivers/block/brd.c
===================================================================
--- linux-2.6.orig/drivers/block/brd.c
+++ linux-2.6/drivers/block/brd.c
@@ -78,11 +78,11 @@ static struct page *brd_lookup_page(stru
 }
 
 /*
- * Look up and return a brd's page for a given sector.
- * If one does not exist, allocate an empty page, and insert that. Then
- * return it.
+ * If the page exists, return true.
+ * If it does not exist, allocate an empty page, and insert that. Return true
+ * if the allocation was successful.
  */
-static struct page *brd_insert_page(struct brd_device *brd, sector_t sector)
+static bool brd_insert_page(struct brd_device *brd, sector_t sector)
 {
 	pgoff_t idx;
 	struct page *page;
@@ -90,7 +90,7 @@ static struct page *brd_insert_page(stru
 
 	page = brd_lookup_page(brd, sector);
 	if (page)
-		return page;
+		return true;
 
 	/*
 	 * Must use NOIO because we don't want to recurse back into the
@@ -99,11 +99,11 @@ static struct page *brd_insert_page(stru
 	gfp_flags = GFP_NOIO | __GFP_ZERO | __GFP_HIGHMEM;
 	page = alloc_page(gfp_flags);
 	if (!page)
-		return NULL;
+		return false;
 
 	if (radix_tree_preload(GFP_NOIO)) {
 		__free_page(page);
-		return NULL;
+		return false;
 	}
 
 	spin_lock(&brd->brd_lock);
@@ -121,7 +121,7 @@ static struct page *brd_insert_page(stru
 
 	radix_tree_preload_end();
 
-	return page;
+	return true;
 }
 
 /*