[XFS] Use the generic bitops rather than implementing them ourselves.

Patch inspired by Andi Kleen. SGI-PV: 971186 SGI-Modid: xfs-linux-melb:xfs-kern:30000a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
author: David Chinner <dgc@sgi.com> 2007-11-23 00:27:59 -0500
committer: Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> 2008-02-07 02:14:22 -0500
commit: a69b176df246d59626e6a9c640b44c0921fa4566 (patch)
tree: ef763ee32c95da88b4aa119d084d5f022e8e0477 /fs/xfs/xfs_bit.c
parent: c319b58b13bb22f9a2478825b06c641c825f51ec (diff)
1 files changed, 0 insertions, 103 deletions
diff --git a/fs/xfs/xfs_bit.c b/fs/xfs/xfs_bit.c
index fab0b6d5a41b..48228848f5ae 100644
--- a/fs/xfs/xfs_bit.c
+++ b/fs/xfs/xfs_bit.c
@@ -25,109 +25,6 @@
 * XFS bit manipulation routines, used in non-realtime code.
 */
-#ifndef HAVE_ARCH_HIGHBIT
-/*
- * Index of high bit number in byte, -1 for none set, 0..7 otherwise.
- */
-static const char xfs_highbit[256] = {
-       -1, 0, 1, 1, 2, 2, 2, 2,                 /* 00 .. 07 */
-        3, 3, 3, 3, 3, 3, 3, 3,                 /* 08 .. 0f */
-        4, 4, 4, 4, 4, 4, 4, 4,                 /* 10 .. 17 */
-        4, 4, 4, 4, 4, 4, 4, 4,                 /* 18 .. 1f */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 20 .. 27 */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 28 .. 2f */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 30 .. 37 */
-        5, 5, 5, 5, 5, 5, 5, 5,                 /* 38 .. 3f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 40 .. 47 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 48 .. 4f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 50 .. 57 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 58 .. 5f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 60 .. 67 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 68 .. 6f */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 70 .. 77 */
-        6, 6, 6, 6, 6, 6, 6, 6,                 /* 78 .. 7f */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 80 .. 87 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 88 .. 8f */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 90 .. 97 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* 98 .. 9f */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* a0 .. a7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* a8 .. af */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* b0 .. b7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* b8 .. bf */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* c0 .. c7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* c8 .. cf */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* d0 .. d7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* d8 .. df */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* e0 .. e7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* e8 .. ef */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* f0 .. f7 */
-        7, 7, 7, 7, 7, 7, 7, 7,                 /* f8 .. ff */
-};
-#endif
-/*
- * xfs_highbit32: get high bit set out of 32-bit argument, -1 if none set.
- */
-inline int
-xfs_highbit32(
-        __uint32_t      v)
-{
-#ifdef HAVE_ARCH_HIGHBIT
-        return highbit32(v);
-#else
-        int             i;
-        if (v & 0xffff0000)
-                if (v & 0xff000000)
-                        i = 24;
-                else
-                        i = 16;
-        else if (v & 0x0000ffff)
-                if (v & 0x0000ff00)
-                        i = 8;
-                else
-                        i = 0;
-        else
-                return -1;
-        return i + xfs_highbit[(v >> i) & 0xff];
-#endif
-}
-/*
- * xfs_lowbit64: get low bit set out of 64-bit argument, -1 if none set.
- */
-int
-xfs_lowbit64(
-        __uint64_t      v)
-{
-        __uint32_t      w = (__uint32_t)v;
-        int             n = 0;
-        if (w) {        /* lower bits */
-                n = ffs(w);
-        } else {        /* upper bits */
-                w = (__uint32_t)(v >> 32);
-                if (w && (n = ffs(w)))
-                        n += 32;
-        }
-        return n - 1;
-}
-/*
- * xfs_highbit64: get high bit set out of 64-bit argument, -1 if none set.
- */
-int
-xfs_highbit64(
-        __uint64_t      v)
-{
-        __uint32_t      h = (__uint32_t)(v >> 32);
-        if (h)
-                return xfs_highbit32(h) + 32;
-        return xfs_highbit32((__uint32_t)v);
-}
 /*
 * Return whether bitmap is empty.
 * Size is number of words in the bitmap, which is padded to word boundary
author	David Chinner <dgc@sgi.com>	2007-11-23 00:27:59 -0500
committer	Lachlan McIlroy <lachlan@redback.melbourne.sgi.com>	2008-02-07 02:14:22 -0500
commit	a69b176df246d59626e6a9c640b44c0921fa4566 (patch)
tree	ef763ee32c95da88b4aa119d084d5f022e8e0477 /fs/xfs/xfs_bit.c
parent	c319b58b13bb22f9a2478825b06c641c825f51ec (diff)

diff --git a/fs/xfs/xfs_bit.c b/fs/xfs/xfs_bit.c index fab0b6d5a41b..48228848f5ae 100644 --- a/fs/xfs/xfs_bit.c +++ b/fs/xfs/xfs_bit.c
@@ -25,109 +25,6 @@
25	* XFS bit manipulation routines, used in non-realtime code.	25	* XFS bit manipulation routines, used in non-realtime code.
26	*/	26	*/
27		27
28	#ifndef HAVE_ARCH_HIGHBIT
29	/*
30	* Index of high bit number in byte, -1 for none set, 0..7 otherwise.
31	*/
32	static const char xfs_highbit[256] = {
33	-1, 0, 1, 1, 2, 2, 2, 2, /* 00 .. 07 */
34	3, 3, 3, 3, 3, 3, 3, 3, /* 08 .. 0f */
35	4, 4, 4, 4, 4, 4, 4, 4, /* 10 .. 17 */
36	4, 4, 4, 4, 4, 4, 4, 4, /* 18 .. 1f */
37	5, 5, 5, 5, 5, 5, 5, 5, /* 20 .. 27 */
38	5, 5, 5, 5, 5, 5, 5, 5, /* 28 .. 2f */
39	5, 5, 5, 5, 5, 5, 5, 5, /* 30 .. 37 */
40	5, 5, 5, 5, 5, 5, 5, 5, /* 38 .. 3f */
41	6, 6, 6, 6, 6, 6, 6, 6, /* 40 .. 47 */
42	6, 6, 6, 6, 6, 6, 6, 6, /* 48 .. 4f */
43	6, 6, 6, 6, 6, 6, 6, 6, /* 50 .. 57 */
44	6, 6, 6, 6, 6, 6, 6, 6, /* 58 .. 5f */
45	6, 6, 6, 6, 6, 6, 6, 6, /* 60 .. 67 */
46	6, 6, 6, 6, 6, 6, 6, 6, /* 68 .. 6f */
47	6, 6, 6, 6, 6, 6, 6, 6, /* 70 .. 77 */
48	6, 6, 6, 6, 6, 6, 6, 6, /* 78 .. 7f */
49	7, 7, 7, 7, 7, 7, 7, 7, /* 80 .. 87 */
50	7, 7, 7, 7, 7, 7, 7, 7, /* 88 .. 8f */
51	7, 7, 7, 7, 7, 7, 7, 7, /* 90 .. 97 */
52	7, 7, 7, 7, 7, 7, 7, 7, /* 98 .. 9f */
53	7, 7, 7, 7, 7, 7, 7, 7, /* a0 .. a7 */
54	7, 7, 7, 7, 7, 7, 7, 7, /* a8 .. af */
55	7, 7, 7, 7, 7, 7, 7, 7, /* b0 .. b7 */
56	7, 7, 7, 7, 7, 7, 7, 7, /* b8 .. bf */
57	7, 7, 7, 7, 7, 7, 7, 7, /* c0 .. c7 */
58	7, 7, 7, 7, 7, 7, 7, 7, /* c8 .. cf */
59	7, 7, 7, 7, 7, 7, 7, 7, /* d0 .. d7 */
60	7, 7, 7, 7, 7, 7, 7, 7, /* d8 .. df */
61	7, 7, 7, 7, 7, 7, 7, 7, /* e0 .. e7 */
62	7, 7, 7, 7, 7, 7, 7, 7, /* e8 .. ef */
63	7, 7, 7, 7, 7, 7, 7, 7, /* f0 .. f7 */
64	7, 7, 7, 7, 7, 7, 7, 7, /* f8 .. ff */
65	};
66	#endif
67
68	/*
69	* xfs_highbit32: get high bit set out of 32-bit argument, -1 if none set.
70	*/
71	inline int
72	xfs_highbit32(
73	__uint32_t v)
74	{
75	#ifdef HAVE_ARCH_HIGHBIT
76	return highbit32(v);
77	#else
78	int i;
79
80	if (v & 0xffff0000)
81	if (v & 0xff000000)
82	i = 24;
83	else
84	i = 16;
85	else if (v & 0x0000ffff)
86	if (v & 0x0000ff00)
87	i = 8;
88	else
89	i = 0;
90	else
91	return -1;
92	return i + xfs_highbit[(v >> i) & 0xff];
93	#endif
94	}
95
96	/*
97	* xfs_lowbit64: get low bit set out of 64-bit argument, -1 if none set.
98	*/
99	int
100	xfs_lowbit64(
101	__uint64_t v)
102	{
103	__uint32_t w = (__uint32_t)v;
104	int n = 0;
105
106	if (w) { /* lower bits */
107	n = ffs(w);
108	} else { /* upper bits */
109	w = (__uint32_t)(v >> 32);
110	if (w && (n = ffs(w)))
111	n += 32;
112	}
113	return n - 1;
114	}
115
116	/*
117	* xfs_highbit64: get high bit set out of 64-bit argument, -1 if none set.
118	*/
119	int
120	xfs_highbit64(
121	__uint64_t v)
122	{
123	__uint32_t h = (__uint32_t)(v >> 32);
124
125	if (h)
126	return xfs_highbit32(h) + 32;
127	return xfs_highbit32((__uint32_t)v);
128	}
129
130
131	/*	28	/*
132	* Return whether bitmap is empty.	29	* Return whether bitmap is empty.
133	* Size is number of words in the bitmap, which is padded to word boundary	30	* Size is number of words in the bitmap, which is padded to word boundary