diff options
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 19 | 
1 files changed, 4 insertions, 15 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 5ebc830297c1..61a97164abcc 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c  | |||
| @@ -1139,22 +1139,11 @@ void rcu_nmi_exit(void) | |||
| 1139 | } | 1139 | } | 
| 1140 | 1140 | ||
| 1141 | /** | 1141 | /** | 
| 1142 | * __rcu_is_watching - are RCU read-side critical sections safe? | ||
| 1143 | * | ||
| 1144 | * Return true if RCU is watching the running CPU, which means that | ||
| 1145 | * this CPU can safely enter RCU read-side critical sections. Unlike | ||
| 1146 | * rcu_is_watching(), the caller of __rcu_is_watching() must have at | ||
| 1147 | * least disabled preemption. | ||
| 1148 | */ | ||
| 1149 | bool notrace __rcu_is_watching(void) | ||
| 1150 | { | ||
| 1151 | return !rcu_dynticks_curr_cpu_in_eqs(); | ||
| 1152 | } | ||
| 1153 | |||
| 1154 | /** | ||
| 1155 | * rcu_is_watching - see if RCU thinks that the current CPU is idle | 1142 | * rcu_is_watching - see if RCU thinks that the current CPU is idle | 
| 1156 | * | 1143 | * | 
| 1157 | * If the current CPU is in its idle loop and is neither in an interrupt | 1144 | * Return true if RCU is watching the running CPU, which means that this | 
| 1145 | * CPU can safely enter RCU read-side critical sections. In other words, | ||
| 1146 | * if the current CPU is in its idle loop and is neither in an interrupt | ||
| 1158 | * or NMI handler, return true. | 1147 | * or NMI handler, return true. | 
| 1159 | */ | 1148 | */ | 
| 1160 | bool notrace rcu_is_watching(void) | 1149 | bool notrace rcu_is_watching(void) | 
| @@ -1162,7 +1151,7 @@ bool notrace rcu_is_watching(void) | |||
| 1162 | bool ret; | 1151 | bool ret; | 
| 1163 | 1152 | ||
| 1164 | preempt_disable_notrace(); | 1153 | preempt_disable_notrace(); | 
| 1165 | ret = __rcu_is_watching(); | 1154 | ret = !rcu_dynticks_curr_cpu_in_eqs(); | 
| 1166 | preempt_enable_notrace(); | 1155 | preempt_enable_notrace(); | 
| 1167 | return ret; | 1156 | return ret; | 
| 1168 | } | 1157 | } | 
