target: Drop incorrect se_lun_acl release for dynamic -> explict ACL conversion
[zen-stable.git] / arch / x86 / include / asm / local.h
blob9cdae5d47e8fad287dfdde2e27e2900b0ff30405
1 #ifndef _ASM_X86_LOCAL_H
2 #define _ASM_X86_LOCAL_H
4 #include <linux/percpu.h>
6 #include <asm/system.h>
7 #include <linux/atomic.h>
8 #include <asm/asm.h>
10 typedef struct {
11 atomic_long_t a;
12 } local_t;
14 #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
16 #define local_read(l) atomic_long_read(&(l)->a)
17 #define local_set(l, i) atomic_long_set(&(l)->a, (i))
19 static inline void local_inc(local_t *l)
21 asm volatile(_ASM_INC "%0"
22 : "+m" (l->a.counter));
25 static inline void local_dec(local_t *l)
27 asm volatile(_ASM_DEC "%0"
28 : "+m" (l->a.counter));
31 static inline void local_add(long i, local_t *l)
33 asm volatile(_ASM_ADD "%1,%0"
34 : "+m" (l->a.counter)
35 : "ir" (i));
38 static inline void local_sub(long i, local_t *l)
40 asm volatile(_ASM_SUB "%1,%0"
41 : "+m" (l->a.counter)
42 : "ir" (i));
45 /**
46 * local_sub_and_test - subtract value from variable and test result
47 * @i: integer value to subtract
48 * @l: pointer to type local_t
50 * Atomically subtracts @i from @l and returns
51 * true if the result is zero, or false for all
52 * other cases.
54 static inline int local_sub_and_test(long i, local_t *l)
56 unsigned char c;
58 asm volatile(_ASM_SUB "%2,%0; sete %1"
59 : "+m" (l->a.counter), "=qm" (c)
60 : "ir" (i) : "memory");
61 return c;
64 /**
65 * local_dec_and_test - decrement and test
66 * @l: pointer to type local_t
68 * Atomically decrements @l by 1 and
69 * returns true if the result is 0, or false for all other
70 * cases.
72 static inline int local_dec_and_test(local_t *l)
74 unsigned char c;
76 asm volatile(_ASM_DEC "%0; sete %1"
77 : "+m" (l->a.counter), "=qm" (c)
78 : : "memory");
79 return c != 0;
82 /**
83 * local_inc_and_test - increment and test
84 * @l: pointer to type local_t
86 * Atomically increments @l by 1
87 * and returns true if the result is zero, or false for all
88 * other cases.
90 static inline int local_inc_and_test(local_t *l)
92 unsigned char c;
94 asm volatile(_ASM_INC "%0; sete %1"
95 : "+m" (l->a.counter), "=qm" (c)
96 : : "memory");
97 return c != 0;
101 * local_add_negative - add and test if negative
102 * @i: integer value to add
103 * @l: pointer to type local_t
105 * Atomically adds @i to @l and returns true
106 * if the result is negative, or false when
107 * result is greater than or equal to zero.
109 static inline int local_add_negative(long i, local_t *l)
111 unsigned char c;
113 asm volatile(_ASM_ADD "%2,%0; sets %1"
114 : "+m" (l->a.counter), "=qm" (c)
115 : "ir" (i) : "memory");
116 return c;
120 * local_add_return - add and return
121 * @i: integer value to add
122 * @l: pointer to type local_t
124 * Atomically adds @i to @l and returns @i + @l
126 static inline long local_add_return(long i, local_t *l)
128 long __i;
129 #ifdef CONFIG_M386
130 unsigned long flags;
131 if (unlikely(boot_cpu_data.x86 <= 3))
132 goto no_xadd;
133 #endif
134 /* Modern 486+ processor */
135 __i = i;
136 asm volatile(_ASM_XADD "%0, %1;"
137 : "+r" (i), "+m" (l->a.counter)
138 : : "memory");
139 return i + __i;
141 #ifdef CONFIG_M386
142 no_xadd: /* Legacy 386 processor */
143 local_irq_save(flags);
144 __i = local_read(l);
145 local_set(l, i + __i);
146 local_irq_restore(flags);
147 return i + __i;
148 #endif
151 static inline long local_sub_return(long i, local_t *l)
153 return local_add_return(-i, l);
156 #define local_inc_return(l) (local_add_return(1, l))
157 #define local_dec_return(l) (local_sub_return(1, l))
159 #define local_cmpxchg(l, o, n) \
160 (cmpxchg_local(&((l)->a.counter), (o), (n)))
161 /* Always has a lock prefix */
162 #define local_xchg(l, n) (xchg(&((l)->a.counter), (n)))
165 * local_add_unless - add unless the number is a given value
166 * @l: pointer of type local_t
167 * @a: the amount to add to l...
168 * @u: ...unless l is equal to u.
170 * Atomically adds @a to @l, so long as it was not @u.
171 * Returns non-zero if @l was not @u, and zero otherwise.
173 #define local_add_unless(l, a, u) \
174 ({ \
175 long c, old; \
176 c = local_read((l)); \
177 for (;;) { \
178 if (unlikely(c == (u))) \
179 break; \
180 old = local_cmpxchg((l), c, c + (a)); \
181 if (likely(old == c)) \
182 break; \
183 c = old; \
185 c != (u); \
187 #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
189 /* On x86_32, these are no better than the atomic variants.
190 * On x86-64 these are better than the atomic variants on SMP kernels
191 * because they dont use a lock prefix.
193 #define __local_inc(l) local_inc(l)
194 #define __local_dec(l) local_dec(l)
195 #define __local_add(i, l) local_add((i), (l))
196 #define __local_sub(i, l) local_sub((i), (l))
198 #endif /* _ASM_X86_LOCAL_H */