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authorJon Mason <jdmason@us.ibm.com>2006-05-19 16:35:32 -0400
committerPaul Mackerras <paulus@samba.org>2006-05-24 02:08:58 -0400
commit0a9cb46a73abd6c45e7c986bec984eed60c417b6 (patch)
treee713d9a0d03de947f3727e6fead942024f4c0767 /arch/powerpc
parent7499bf1a4cabde789e7694b33d01a1913ae1dddf (diff)
[PATCH] remove powerpc bitops in favor of existing generic bitops
There already exists a big endian safe bitops implementation in lib/find_next_bit.c. The code in it is 90%+ common with the powerpc specific version, so the powerpc version is redundant. This patch makes the necessary changes to use the generic bitops in powerpc, and removes the powerpc specific version. Signed-off-by: Jon Mason <jdmason@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/Kconfig4
-rw-r--r--arch/powerpc/lib/Makefile1
-rw-r--r--arch/powerpc/lib/bitops.c150
3 files changed, 4 insertions, 151 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 6729c98b66f..75ba0ec49e5 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -45,6 +45,10 @@ config GENERIC_CALIBRATE_DELAY
45 bool 45 bool
46 default y 46 default y
47 47
48config GENERIC_FIND_NEXT_BIT
49 bool
50 default y
51
48config PPC 52config PPC
49 bool 53 bool
50 default y 54 default y
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 34f5c2e074c..ae354d65b82 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -7,7 +7,6 @@ obj-y := string.o strcase.o
7obj-$(CONFIG_PPC32) += div64.o copy_32.o checksum_32.o 7obj-$(CONFIG_PPC32) += div64.o copy_32.o checksum_32.o
8endif 8endif
9 9
10obj-y += bitops.o
11obj-$(CONFIG_PPC64) += checksum_64.o copypage_64.o copyuser_64.o \ 10obj-$(CONFIG_PPC64) += checksum_64.o copypage_64.o copyuser_64.o \
12 memcpy_64.o usercopy_64.o mem_64.o string.o \ 11 memcpy_64.o usercopy_64.o mem_64.o string.o \
13 strcase.o 12 strcase.o
diff --git a/arch/powerpc/lib/bitops.c b/arch/powerpc/lib/bitops.c
deleted file mode 100644
index f68ad71a018..00000000000
--- a/arch/powerpc/lib/bitops.c
+++ /dev/null
@@ -1,150 +0,0 @@
1#include <linux/types.h>
2#include <linux/module.h>
3#include <asm/byteorder.h>
4#include <asm/bitops.h>
5
6/**
7 * find_next_bit - find the next set bit in a memory region
8 * @addr: The address to base the search on
9 * @offset: The bitnumber to start searching at
10 * @size: The maximum size to search
11 */
12unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
13 unsigned long offset)
14{
15 const unsigned long *p = addr + BITOP_WORD(offset);
16 unsigned long result = offset & ~(BITS_PER_LONG-1);
17 unsigned long tmp;
18
19 if (offset >= size)
20 return size;
21 size -= result;
22 offset %= BITS_PER_LONG;
23 if (offset) {
24 tmp = *(p++);
25 tmp &= (~0UL << offset);
26 if (size < BITS_PER_LONG)
27 goto found_first;
28 if (tmp)
29 goto found_middle;
30 size -= BITS_PER_LONG;
31 result += BITS_PER_LONG;
32 }
33 while (size & ~(BITS_PER_LONG-1)) {
34 if ((tmp = *(p++)))
35 goto found_middle;
36 result += BITS_PER_LONG;
37 size -= BITS_PER_LONG;
38 }
39 if (!size)
40 return result;
41 tmp = *p;
42
43found_first:
44 tmp &= (~0UL >> (BITS_PER_LONG - size));
45 if (tmp == 0UL) /* Are any bits set? */
46 return result + size; /* Nope. */
47found_middle:
48 return result + __ffs(tmp);
49}
50EXPORT_SYMBOL(find_next_bit);
51
52/*
53 * This implementation of find_{first,next}_zero_bit was stolen from
54 * Linus' asm-alpha/bitops.h.
55 */
56unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
57 unsigned long offset)
58{
59 const unsigned long *p = addr + BITOP_WORD(offset);
60 unsigned long result = offset & ~(BITS_PER_LONG-1);
61 unsigned long tmp;
62
63 if (offset >= size)
64 return size;
65 size -= result;
66 offset %= BITS_PER_LONG;
67 if (offset) {
68 tmp = *(p++);
69 tmp |= ~0UL >> (BITS_PER_LONG - offset);
70 if (size < BITS_PER_LONG)
71 goto found_first;
72 if (~tmp)
73 goto found_middle;
74 size -= BITS_PER_LONG;
75 result += BITS_PER_LONG;
76 }
77 while (size & ~(BITS_PER_LONG-1)) {
78 if (~(tmp = *(p++)))
79 goto found_middle;
80 result += BITS_PER_LONG;
81 size -= BITS_PER_LONG;
82 }
83 if (!size)
84 return result;
85 tmp = *p;
86
87found_first:
88 tmp |= ~0UL << size;
89 if (tmp == ~0UL) /* Are any bits zero? */
90 return result + size; /* Nope. */
91found_middle:
92 return result + ffz(tmp);
93}
94EXPORT_SYMBOL(find_next_zero_bit);
95
96static inline unsigned int ext2_ilog2(unsigned int x)
97{
98 int lz;
99
100 asm("cntlzw %0,%1": "=r"(lz):"r"(x));
101 return 31 - lz;
102}
103
104static inline unsigned int ext2_ffz(unsigned int x)
105{
106 u32 rc;
107 if ((x = ~x) == 0)
108 return 32;
109 rc = ext2_ilog2(x & -x);
110 return rc;
111}
112
113unsigned long find_next_zero_le_bit(const unsigned long *addr,
114 unsigned long size, unsigned long offset)
115{
116 const unsigned int *p = ((const unsigned int *)addr) + (offset >> 5);
117 unsigned int result = offset & ~31;
118 unsigned int tmp;
119
120 if (offset >= size)
121 return size;
122 size -= result;
123 offset &= 31;
124 if (offset) {
125 tmp = cpu_to_le32p(p++);
126 tmp |= ~0U >> (32 - offset); /* bug or feature ? */
127 if (size < 32)
128 goto found_first;
129 if (tmp != ~0)
130 goto found_middle;
131 size -= 32;
132 result += 32;
133 }
134 while (size >= 32) {
135 if ((tmp = cpu_to_le32p(p++)) != ~0)
136 goto found_middle;
137 result += 32;
138 size -= 32;
139 }
140 if (!size)
141 return result;
142 tmp = cpu_to_le32p(p);
143found_first:
144 tmp |= ~0 << size;
145 if (tmp == ~0) /* Are any bits zero? */
146 return result + size; /* Nope. */
147found_middle:
148 return result + ext2_ffz(tmp);
149}
150EXPORT_SYMBOL(find_next_zero_le_bit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-19 10:47:46 -0400