[XFS] Kill off xfs_count_bits

xfs_count_bits is only called once, and is then compared to 0. IOW, what
it really wants to know is, is the bitmap empty. This can be done more
simply, certainly.

SGI-PV: 966503
SGI-Modid: xfs-linux-melb:xfs-kern:28944a

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 9 insertions, 82 deletions

diff --git a/fs/xfs/xfs_bit.c b/fs/xfs/xfs_bit.c
index 1afe07f67e3b..fab0b6d5a41b 100644
--- a/fs/xfs/xfs_bit.c
+++ b/fs/xfs/xfs_bit.c
@@ -66,44 +66,6 @@ static const char xfs_highbit[256] = {
 #endif
 
 /*
- * Count of bits set in byte, 0..8.
- */
-static const char xfs_countbit[256] = {
-	0, 1, 1, 2, 1, 2, 2, 3,			/* 00 .. 07 */
-	1, 2, 2, 3, 2, 3, 3, 4,			/* 08 .. 0f */
-	1, 2, 2, 3, 2, 3, 3, 4,			/* 10 .. 17 */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 18 .. 1f */
-	1, 2, 2, 3, 2, 3, 3, 4,			/* 20 .. 27 */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 28 .. 2f */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 30 .. 37 */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* 38 .. 3f */
-	1, 2, 2, 3, 2, 3, 3, 4,			/* 40 .. 47 */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 48 .. 4f */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 50 .. 57 */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* 58 .. 5f */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 60 .. 67 */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* 68 .. 6f */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* 70 .. 77 */
-	4, 5, 5, 6, 5, 6, 6, 7,			/* 78 .. 7f */
-	1, 2, 2, 3, 2, 3, 3, 4,			/* 80 .. 87 */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 88 .. 8f */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* 90 .. 97 */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* 98 .. 9f */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* a0 .. a7 */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* a8 .. af */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* b0 .. b7 */
-	4, 5, 5, 6, 5, 6, 6, 7,			/* b8 .. bf */
-	2, 3, 3, 4, 3, 4, 4, 5,			/* c0 .. c7 */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* c8 .. cf */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* d0 .. d7 */
-	4, 5, 5, 6, 5, 6, 6, 7,			/* d8 .. df */
-	3, 4, 4, 5, 4, 5, 5, 6,			/* e0 .. e7 */
-	4, 5, 5, 6, 5, 6, 6, 7,			/* e8 .. ef */
-	4, 5, 5, 6, 5, 6, 6, 7,			/* f0 .. f7 */
-	5, 6, 6, 7, 6, 7, 7, 8,			/* f8 .. ff */
-};
-
-/*
  * xfs_highbit32: get high bit set out of 32-bit argument, -1 if none set.
  */
 inline int
@@ -167,56 +129,21 @@ xfs_highbit64(
 
 
 /*
- * Count the number of bits set in the bitmap starting with bit
- * start_bit.  Size is the size of the bitmap in words.
- *
- * Do the counting by mapping a byte value to the number of set
- * bits for that value using the xfs_countbit array, i.e.
- * xfs_countbit[0] == 0, xfs_countbit[1] == 1, xfs_countbit[2] == 1,
- * xfs_countbit[3] == 2, etc.
+ * Return whether bitmap is empty.
+ * Size is number of words in the bitmap, which is padded to word boundary
+ * Returns 1 for empty, 0 for non-empty.
  */
 int
-xfs_count_bits(uint *map, uint size, uint start_bit)
+xfs_bitmap_empty(uint *map, uint size)
 {
-	register int	bits;
-	register unsigned char	*bytep;
-	register unsigned char	*end_map;
-	int		byte_bit;
-
-	bits = 0;
-	end_map = (char*)(map + size);
-	bytep = (char*)(map + (start_bit & ~0x7));
-	byte_bit = start_bit & 0x7;
-
-	/*
-	 * If the caller fell off the end of the map, return 0.
-	 */
-	if (bytep >= end_map) {
-		return (0);
-	}
-
-	/*
-	 * If start_bit is not byte aligned, then process the
-	 * first byte separately.
-	 */
-	if (byte_bit != 0) {
-		/*
-		 * Shift off the bits we don't want to look at,
-		 * before indexing into xfs_countbit.
-		 */
-		bits += xfs_countbit[(*bytep >> byte_bit)];
-		bytep++;
-	}
+	uint i;
+	uint ret = 0;
 
-	/*
-	 * Count the bits in each byte until the end of the bitmap.
-	 */
-	while (bytep < end_map) {
-		bits += xfs_countbit[*bytep];
-		bytep++;
+	for (i = 0; i < size; i++) {
+		ret |= map[i];
 	}
 
-	return (bits);
+	return (ret == 0);
 }
 
 /*