[PATCH 03/10] qnx4fs: use memweight()

From: Akinobu Mita
Date: Sun May 20 2012 - 09:24:51 EST


Use memweight() to count the total number of bits clear in memory area.

Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Anders Larsen <al@xxxxxxxxxxx>
---
fs/qnx4/bitmap.c | 24 +++++-------------------
1 files changed, 5 insertions(+), 19 deletions(-)

diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
index 22e0d60..fc04ef1 100644
--- a/fs/qnx4/bitmap.c
+++ b/fs/qnx4/bitmap.c
@@ -17,23 +17,6 @@
#include <linux/bitops.h>
#include "qnx4.h"

-static void count_bits(register const char *bmPart, register int size,
- int *const tf)
-{
- char b;
- int tot = *tf;
-
- if (size > QNX4_BLOCK_SIZE) {
- size = QNX4_BLOCK_SIZE;
- }
- do {
- b = *bmPart++;
- tot += 8 - hweight8(b);
- size--;
- } while (size != 0);
- *tf = tot;
-}
-
unsigned long qnx4_count_free_blocks(struct super_block *sb)
{
int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
@@ -44,13 +27,16 @@ unsigned long qnx4_count_free_blocks(struct super_block *sb)
struct buffer_head *bh;

while (total < size) {
+ int bytes = min(size - total, QNX4_BLOCK_SIZE);
+
if ((bh = sb_bread(sb, start + offset)) == NULL) {
printk(KERN_ERR "qnx4: I/O error in counting free blocks\n");
break;
}
- count_bits(bh->b_data, size - total, &total_free);
+ total_free += bytes * BITS_PER_BYTE-
+ memweight(bh->b_data, bytes);
brelse(bh);
- total += QNX4_BLOCK_SIZE;
+ total += bytes;
offset++;
}

--
1.7.7.6

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