[PATCH 1/3] fs/unionfs/: Use __roundup_pow_of_two instead of custom rounding code

["Josef 'Jeff' Sipek" <jsipek@cs.sunysb.edu>]

Signed-off-by: Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu>
---
 fs/unionfs/rdstate.c |   11 ++---------
 fs/unionfs/union.h   |    1 +
 2 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/fs/unionfs/rdstate.c b/fs/unionfs/rdstate.c
index 16ce1bf..e240285 100644
--- a/fs/unionfs/rdstate.c
+++ b/fs/unionfs/rdstate.c
@@ -115,19 +115,12 @@ struct unionfs_dir_state *alloc_rdstate(struct inode *inode, int bindex)
 {
 	int i = 0;
 	int hashsize;
-	int mallocsize = sizeof(struct unionfs_dir_state);
+	unsigned long mallocsize = sizeof(struct unionfs_dir_state);
 	struct unionfs_dir_state *rdstate;
 
 	hashsize = guesstimate_hash_size(inode);
 	mallocsize += hashsize * sizeof(struct list_head);
-	/* Round it up to the next highest power of two. */
-	mallocsize--;
-	mallocsize |= mallocsize >> 1;
-	mallocsize |= mallocsize >> 2;
-	mallocsize |= mallocsize >> 4;
-	mallocsize |= mallocsize >> 8;
-	mallocsize |= mallocsize >> 16;
-	mallocsize++;
+	mallocsize = __roundup_pow_of_two(mallocsize);
 
 	/* This should give us about 500 entries anyway. */
 	if (mallocsize > PAGE_SIZE)
diff --git a/fs/unionfs/union.h b/fs/unionfs/union.h
index 8e9a1cc..fc87b03 100644
--- a/fs/unionfs/union.h
+++ b/fs/unionfs/union.h
@@ -41,6 +41,7 @@
 #include <linux/xattr.h>
 #include <linux/fs_stack.h>
 #include <linux/magic.h>
+#include <linux/log2.h>
 
 #include <asm/mman.h>
 #include <asm/system.h>
-- 
1.5.0.rc3.g5057