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-rw-r--r--include/linux/rcupdate.h24
1 files changed, 20 insertions, 4 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 48dfe00070c7..b4ca73d65891 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -163,14 +163,22 @@ extern int rcu_needs_cpu(int cpu);
163 * 163 *
164 * It is illegal to block while in an RCU read-side critical section. 164 * It is illegal to block while in an RCU read-side critical section.
165 */ 165 */
166#define rcu_read_lock() preempt_disable() 166#define rcu_read_lock() \
167 do { \
168 preempt_disable(); \
169 __acquire(RCU); \
170 } while(0)
167 171
168/** 172/**
169 * rcu_read_unlock - marks the end of an RCU read-side critical section. 173 * rcu_read_unlock - marks the end of an RCU read-side critical section.
170 * 174 *
171 * See rcu_read_lock() for more information. 175 * See rcu_read_lock() for more information.
172 */ 176 */
173#define rcu_read_unlock() preempt_enable() 177#define rcu_read_unlock() \
178 do { \
179 __release(RCU); \
180 preempt_enable(); \
181 } while(0)
174 182
175/* 183/*
176 * So where is rcu_write_lock()? It does not exist, as there is no 184 * So where is rcu_write_lock()? It does not exist, as there is no
@@ -193,14 +201,22 @@ extern int rcu_needs_cpu(int cpu);
193 * can use just rcu_read_lock(). 201 * can use just rcu_read_lock().
194 * 202 *
195 */ 203 */
196#define rcu_read_lock_bh() local_bh_disable() 204#define rcu_read_lock_bh() \
205 do { \
206 local_bh_disable(); \
207 __acquire(RCU_BH); \
208 } while(0)
197 209
198/* 210/*
199 * rcu_read_unlock_bh - marks the end of a softirq-only RCU critical section 211 * rcu_read_unlock_bh - marks the end of a softirq-only RCU critical section
200 * 212 *
201 * See rcu_read_lock_bh() for more information. 213 * See rcu_read_lock_bh() for more information.
202 */ 214 */
203#define rcu_read_unlock_bh() local_bh_enable() 215#define rcu_read_unlock_bh() \
216 do { \
217 __release(RCU_BH); \
218 local_bh_enable(); \
219 } while(0)
204 220
205/** 221/**
206 * rcu_dereference - fetch an RCU-protected pointer in an 222 * rcu_dereference - fetch an RCU-protected pointer in an