ntfs: use is_power_of_2() function for clarity.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 4 insertions, 2 deletions

diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 82c5085559c6..9938034762cc 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -27,6 +27,7 @@
 #include <linux/pagemap.h>
 #include <linux/quotaops.h>
 #include <linux/slab.h>
+#include <linux/log2.h>
 
 #include "aops.h"
 #include "attrib.h"
@@ -1570,7 +1571,7 @@ static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
         ntfs_debug("Index collation rule is 0x%x.",
                         le32_to_cpu(ir->collation_rule));
         ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
-        if (ni->itype.index.block_size & (ni->itype.index.block_size - 1)) {
+        if (!is_power_of_2(ni->itype.index.block_size)) {
                 ntfs_error(vi->i_sb, "Index block size (%u) is not a power of "
                                 "two.", ni->itype.index.block_size);
                 goto unm_err_out;
diff --git a/fs/ntfs/logfile.c b/fs/ntfs/logfile.c
index d7932e95b1fd..89b02985c054 100644
--- a/fs/ntfs/logfile.c
+++ b/fs/ntfs/logfile.c
@@ -26,6 +26,7 @@
 #include <linux/highmem.h>
 #include <linux/buffer_head.h>
 #include <linux/bitops.h>
+#include <linux/log2.h>
 
 #include "attrib.h"
 #include "aops.h"
@@ -65,7 +66,7 @@ static bool ntfs_check_restart_page_header(struct inode *vi,
                         logfile_log_page_size < NTFS_BLOCK_SIZE ||
                         logfile_system_page_size &
                         (logfile_system_page_size - 1) ||
-                        logfile_log_page_size & (logfile_log_page_size - 1)) {
+                        !is_power_of_2(logfile_log_page_size)) {
                 ntfs_error(vi->i_sb, "$LogFile uses unsupported page size.");
                 return false;
         }