spinlock.c (fb3a6bbc912b12347614e5742c7c61416cdb0ca0) spinlock.c (e5931943d02bf751b1ec849c0d2ade23d76a8d41)
1/*
2 * arch/s390/lib/spinlock.c
3 * Out of line spinlock code.
4 *
5 * Copyright (C) IBM Corp. 2004, 2006
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8

--- 101 unchanged lines hidden (view full) ---

110 unsigned int old;
111 int count = spin_retry;
112
113 while (1) {
114 if (count-- <= 0) {
115 _raw_yield();
116 count = spin_retry;
117 }
1/*
2 * arch/s390/lib/spinlock.c
3 * Out of line spinlock code.
4 *
5 * Copyright (C) IBM Corp. 2004, 2006
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8

--- 101 unchanged lines hidden (view full) ---

110 unsigned int old;
111 int count = spin_retry;
112
113 while (1) {
114 if (count-- <= 0) {
115 _raw_yield();
116 count = spin_retry;
117 }
118 if (!__raw_read_can_lock(rw))
118 if (!arch_read_can_lock(rw))
119 continue;
120 old = rw->lock & 0x7fffffffU;
121 if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
122 return;
123 }
124}
125EXPORT_SYMBOL(_raw_read_lock_wait);
126
127void _raw_read_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
128{
129 unsigned int old;
130 int count = spin_retry;
131
132 local_irq_restore(flags);
133 while (1) {
134 if (count-- <= 0) {
135 _raw_yield();
136 count = spin_retry;
137 }
119 continue;
120 old = rw->lock & 0x7fffffffU;
121 if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
122 return;
123 }
124}
125EXPORT_SYMBOL(_raw_read_lock_wait);
126
127void _raw_read_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
128{
129 unsigned int old;
130 int count = spin_retry;
131
132 local_irq_restore(flags);
133 while (1) {
134 if (count-- <= 0) {
135 _raw_yield();
136 count = spin_retry;
137 }
138 if (!__raw_read_can_lock(rw))
138 if (!arch_read_can_lock(rw))
139 continue;
140 old = rw->lock & 0x7fffffffU;
141 local_irq_disable();
142 if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
143 return;
144 }
145}
146EXPORT_SYMBOL(_raw_read_lock_wait_flags);
147
148int _raw_read_trylock_retry(arch_rwlock_t *rw)
149{
150 unsigned int old;
151 int count = spin_retry;
152
153 while (count-- > 0) {
139 continue;
140 old = rw->lock & 0x7fffffffU;
141 local_irq_disable();
142 if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
143 return;
144 }
145}
146EXPORT_SYMBOL(_raw_read_lock_wait_flags);
147
148int _raw_read_trylock_retry(arch_rwlock_t *rw)
149{
150 unsigned int old;
151 int count = spin_retry;
152
153 while (count-- > 0) {
154 if (!__raw_read_can_lock(rw))
154 if (!arch_read_can_lock(rw))
155 continue;
156 old = rw->lock & 0x7fffffffU;
157 if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
158 return 1;
159 }
160 return 0;
161}
162EXPORT_SYMBOL(_raw_read_trylock_retry);
163
164void _raw_write_lock_wait(arch_rwlock_t *rw)
165{
166 int count = spin_retry;
167
168 while (1) {
169 if (count-- <= 0) {
170 _raw_yield();
171 count = spin_retry;
172 }
155 continue;
156 old = rw->lock & 0x7fffffffU;
157 if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)
158 return 1;
159 }
160 return 0;
161}
162EXPORT_SYMBOL(_raw_read_trylock_retry);
163
164void _raw_write_lock_wait(arch_rwlock_t *rw)
165{
166 int count = spin_retry;
167
168 while (1) {
169 if (count-- <= 0) {
170 _raw_yield();
171 count = spin_retry;
172 }
173 if (!__raw_write_can_lock(rw))
173 if (!arch_write_can_lock(rw))
174 continue;
175 if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
176 return;
177 }
178}
179EXPORT_SYMBOL(_raw_write_lock_wait);
180
181void _raw_write_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
182{
183 int count = spin_retry;
184
185 local_irq_restore(flags);
186 while (1) {
187 if (count-- <= 0) {
188 _raw_yield();
189 count = spin_retry;
190 }
174 continue;
175 if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
176 return;
177 }
178}
179EXPORT_SYMBOL(_raw_write_lock_wait);
180
181void _raw_write_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
182{
183 int count = spin_retry;
184
185 local_irq_restore(flags);
186 while (1) {
187 if (count-- <= 0) {
188 _raw_yield();
189 count = spin_retry;
190 }
191 if (!__raw_write_can_lock(rw))
191 if (!arch_write_can_lock(rw))
192 continue;
193 local_irq_disable();
194 if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
195 return;
196 }
197}
198EXPORT_SYMBOL(_raw_write_lock_wait_flags);
199
200int _raw_write_trylock_retry(arch_rwlock_t *rw)
201{
202 int count = spin_retry;
203
204 while (count-- > 0) {
192 continue;
193 local_irq_disable();
194 if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
195 return;
196 }
197}
198EXPORT_SYMBOL(_raw_write_lock_wait_flags);
199
200int _raw_write_trylock_retry(arch_rwlock_t *rw)
201{
202 int count = spin_retry;
203
204 while (count-- > 0) {
205 if (!__raw_write_can_lock(rw))
205 if (!arch_write_can_lock(rw))
206 continue;
207 if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
208 return 1;
209 }
210 return 0;
211}
212EXPORT_SYMBOL(_raw_write_trylock_retry);
206 continue;
207 if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)
208 return 1;
209 }
210 return 0;
211}
212EXPORT_SYMBOL(_raw_write_trylock_retry);