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authorPaul Gortmaker <paul.gortmaker@windriver.com>2012-04-01 16:38:42 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-02 17:41:26 -0400
commit9e5228ce0b9619bde7dcd6c51fb26e2401cfe81a (patch)
tree4fdfdd44fbbf3e62cb4a9691dd537955ee91a072 /arch/parisc
parent1512cdc3572dac34a1809764f9a646cde7e82407 (diff)
parisc: fix missing cmpxchg file error from system.h split
Commit b4816afa3986 ("Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h") introduced the concept of asm/cmpxchg.h but the parisc arch never got one. Fork the cmpxchg content out of the asm/atomic.h file to create one. Some minor whitespace fixups were done on the block of code that created the new file. Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/include/asm/atomic.h107
-rw-r--r--arch/parisc/include/asm/cmpxchg.h116
2 files changed, 117 insertions, 106 deletions
diff --git a/arch/parisc/include/asm/atomic.h b/arch/parisc/include/asm/atomic.h
index 3ae56073cc3d..6c6defc24619 100644
--- a/arch/parisc/include/asm/atomic.h
+++ b/arch/parisc/include/asm/atomic.h
@@ -6,6 +6,7 @@
6#define _ASM_PARISC_ATOMIC_H_ 6#define _ASM_PARISC_ATOMIC_H_
7 7
8#include <linux/types.h> 8#include <linux/types.h>
9#include <asm/cmpxchg.h>
9 10
10/* 11/*
11 * Atomic operations that C can't guarantee us. Useful for 12 * Atomic operations that C can't guarantee us. Useful for
@@ -48,112 +49,6 @@ extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;
48# define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0) 49# define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
49#endif 50#endif
50 51
51/* This should get optimized out since it's never called.
52** Or get a link error if xchg is used "wrong".
53*/
54extern void __xchg_called_with_bad_pointer(void);
55
56
57/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
58extern unsigned long __xchg8(char, char *);
59extern unsigned long __xchg32(int, int *);
60#ifdef CONFIG_64BIT
61extern unsigned long __xchg64(unsigned long, unsigned long *);
62#endif
63
64/* optimizer better get rid of switch since size is a constant */
65static __inline__ unsigned long
66__xchg(unsigned long x, __volatile__ void * ptr, int size)
67{
68 switch(size) {
69#ifdef CONFIG_64BIT
70 case 8: return __xchg64(x,(unsigned long *) ptr);
71#endif
72 case 4: return __xchg32((int) x, (int *) ptr);
73 case 1: return __xchg8((char) x, (char *) ptr);
74 }
75 __xchg_called_with_bad_pointer();
76 return x;
77}
78
79
80/*
81** REVISIT - Abandoned use of LDCW in xchg() for now:
82** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
83** o and while we are at it, could CONFIG_64BIT code use LDCD too?
84**
85** if (__builtin_constant_p(x) && (x == NULL))
86** if (((unsigned long)p & 0xf) == 0)
87** return __ldcw(p);
88*/
89#define xchg(ptr,x) \
90 ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
91
92
93#define __HAVE_ARCH_CMPXCHG 1
94
95/* bug catcher for when unsupported size is used - won't link */
96extern void __cmpxchg_called_with_bad_pointer(void);
97
98/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
99extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old, unsigned int new_);
100extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new_);
101
102/* don't worry...optimizer will get rid of most of this */
103static __inline__ unsigned long
104__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
105{
106 switch(size) {
107#ifdef CONFIG_64BIT
108 case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
109#endif
110 case 4: return __cmpxchg_u32((unsigned int *)ptr, (unsigned int) old, (unsigned int) new_);
111 }
112 __cmpxchg_called_with_bad_pointer();
113 return old;
114}
115
116#define cmpxchg(ptr,o,n) \
117 ({ \
118 __typeof__(*(ptr)) _o_ = (o); \
119 __typeof__(*(ptr)) _n_ = (n); \
120 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
121 (unsigned long)_n_, sizeof(*(ptr))); \
122 })
123
124#include <asm-generic/cmpxchg-local.h>
125
126static inline unsigned long __cmpxchg_local(volatile void *ptr,
127 unsigned long old,
128 unsigned long new_, int size)
129{
130 switch (size) {
131#ifdef CONFIG_64BIT
132 case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
133#endif
134 case 4: return __cmpxchg_u32(ptr, old, new_);
135 default:
136 return __cmpxchg_local_generic(ptr, old, new_, size);
137 }
138}
139
140/*
141 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
142 * them available.
143 */
144#define cmpxchg_local(ptr, o, n) \
145 ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
146 (unsigned long)(n), sizeof(*(ptr))))
147#ifdef CONFIG_64BIT
148#define cmpxchg64_local(ptr, o, n) \
149 ({ \
150 BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
151 cmpxchg_local((ptr), (o), (n)); \
152 })
153#else
154#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
155#endif
156
157/* 52/*
158 * Note that we need not lock read accesses - aligned word writes/reads 53 * Note that we need not lock read accesses - aligned word writes/reads
159 * are atomic, so a reader never sees inconsistent values. 54 * are atomic, so a reader never sees inconsistent values.
diff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h
new file mode 100644
index 000000000000..dbd13354ec41
--- /dev/null
+++ b/arch/parisc/include/asm/cmpxchg.h
@@ -0,0 +1,116 @@
1/*
2 * forked from parisc asm/atomic.h which was:
3 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
4 * Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
5 */
6
7#ifndef _ASM_PARISC_CMPXCHG_H_
8#define _ASM_PARISC_CMPXCHG_H_
9
10/* This should get optimized out since it's never called.
11** Or get a link error if xchg is used "wrong".
12*/
13extern void __xchg_called_with_bad_pointer(void);
14
15/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
16extern unsigned long __xchg8(char, char *);
17extern unsigned long __xchg32(int, int *);
18#ifdef CONFIG_64BIT
19extern unsigned long __xchg64(unsigned long, unsigned long *);
20#endif
21
22/* optimizer better get rid of switch since size is a constant */
23static inline unsigned long
24__xchg(unsigned long x, __volatile__ void *ptr, int size)
25{
26 switch (size) {
27#ifdef CONFIG_64BIT
28 case 8: return __xchg64(x, (unsigned long *) ptr);
29#endif
30 case 4: return __xchg32((int) x, (int *) ptr);
31 case 1: return __xchg8((char) x, (char *) ptr);
32 }
33 __xchg_called_with_bad_pointer();
34 return x;
35}
36
37/*
38** REVISIT - Abandoned use of LDCW in xchg() for now:
39** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
40** o and while we are at it, could CONFIG_64BIT code use LDCD too?
41**
42** if (__builtin_constant_p(x) && (x == NULL))
43** if (((unsigned long)p & 0xf) == 0)
44** return __ldcw(p);
45*/
46#define xchg(ptr, x) \
47 ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
48
49#define __HAVE_ARCH_CMPXCHG 1
50
51/* bug catcher for when unsupported size is used - won't link */
52extern void __cmpxchg_called_with_bad_pointer(void);
53
54/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
55extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old,
56 unsigned int new_);
57extern unsigned long __cmpxchg_u64(volatile unsigned long *ptr,
58 unsigned long old, unsigned long new_);
59
60/* don't worry...optimizer will get rid of most of this */
61static inline unsigned long
62__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
63{
64 switch (size) {
65#ifdef CONFIG_64BIT
66 case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
67#endif
68 case 4: return __cmpxchg_u32((unsigned int *)ptr,
69 (unsigned int)old, (unsigned int)new_);
70 }
71 __cmpxchg_called_with_bad_pointer();
72 return old;
73}
74
75#define cmpxchg(ptr, o, n) \
76({ \
77 __typeof__(*(ptr)) _o_ = (o); \
78 __typeof__(*(ptr)) _n_ = (n); \
79 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
80 (unsigned long)_n_, sizeof(*(ptr))); \
81})
82
83#include <asm-generic/cmpxchg-local.h>
84
85static inline unsigned long __cmpxchg_local(volatile void *ptr,
86 unsigned long old,
87 unsigned long new_, int size)
88{
89 switch (size) {
90#ifdef CONFIG_64BIT
91 case 8: return __cmpxchg_u64((unsigned long *)ptr, old, new_);
92#endif
93 case 4: return __cmpxchg_u32(ptr, old, new_);
94 default:
95 return __cmpxchg_local_generic(ptr, old, new_, size);
96 }
97}
98
99/*
100 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
101 * them available.
102 */
103#define cmpxchg_local(ptr, o, n) \
104 ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
105 (unsigned long)(n), sizeof(*(ptr))))
106#ifdef CONFIG_64BIT
107#define cmpxchg64_local(ptr, o, n) \
108({ \
109 BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
110 cmpxchg_local((ptr), (o), (n)); \
111})
112#else
113#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
114#endif
115
116#endif /* _ASM_PARISC_CMPXCHG_H_ */
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