IMHO it's a good thing to add __must_check in new code where it has sense.
Index: btrfs-unstable-standalone/ctree.c
===================================================================
--- btrfs-unstable-standalone.orig/ctree.c 2008-12-29 21:57:15.366588465 +0100
+++ btrfs-unstable-standalone/ctree.c 2008-12-29 21:58:06.878588402 +0100
@@ -43,7 +43,7 @@
memset(p, 0, sizeof(*p));
}
-struct btrfs_path *btrfs_alloc_path(void)
+struct btrfs_path __must_check *btrfs_alloc_path(void)
{
struct btrfs_path *path;
path = kmem_cache_alloc(btrfs_path_cachep, GFP_NOFS);
--
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