aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--include/linux/rcupreempt.h51
-rw-r--r--kernel/rcupreempt.c48
2 files changed, 53 insertions, 46 deletions
diff --git a/include/linux/rcupreempt.h b/include/linux/rcupreempt.h
index 74304b4538d..3eb8fdd1944 100644
--- a/include/linux/rcupreempt.h
+++ b/include/linux/rcupreempt.h
@@ -40,30 +40,15 @@
#include <linux/cpumask.h>
#include <linux/seqlock.h>
-struct rcu_dyntick_sched {
- int dynticks;
- int dynticks_snap;
- int sched_qs;
- int sched_qs_snap;
- int sched_dynticks_snap;
-};
-
-DECLARE_PER_CPU(struct rcu_dyntick_sched, rcu_dyntick_sched);
-
-static inline void rcu_qsctr_inc(int cpu)
-{
- struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
-
- rdssp->sched_qs++;
-}
-#define rcu_bh_qsctr_inc(cpu)
+extern void rcu_qsctr_inc(int cpu);
+static inline void rcu_bh_qsctr_inc(int cpu) { }
/*
* Someone might want to pass call_rcu_bh as a function pointer.
* So this needs to just be a rename and not a macro function.
* (no parentheses)
*/
-#define call_rcu_bh call_rcu
+#define call_rcu_bh call_rcu
/**
* call_rcu_sched - Queue RCU callback for invocation after sched grace period.
@@ -117,30 +102,12 @@ extern struct rcupreempt_trace *rcupreempt_trace_cpu(int cpu);
struct softirq_action;
#ifdef CONFIG_NO_HZ
-
-static inline void rcu_enter_nohz(void)
-{
- static DEFINE_RATELIMIT_STATE(rs, 10 * HZ, 1);
-
- smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
- __get_cpu_var(rcu_dyntick_sched).dynticks++;
- WARN_ON_RATELIMIT(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1, &rs);
-}
-
-static inline void rcu_exit_nohz(void)
-{
- static DEFINE_RATELIMIT_STATE(rs, 10 * HZ, 1);
-
- __get_cpu_var(rcu_dyntick_sched).dynticks++;
- smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
- WARN_ON_RATELIMIT(!(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1),
- &rs);
-}
-
-#else /* CONFIG_NO_HZ */
-#define rcu_enter_nohz() do { } while (0)
-#define rcu_exit_nohz() do { } while (0)
-#endif /* CONFIG_NO_HZ */
+extern void rcu_enter_nohz(void);
+extern void rcu_exit_nohz(void);
+#else
+# define rcu_enter_nohz() do { } while (0)
+# define rcu_exit_nohz() do { } while (0)
+#endif
/*
* A context switch is a grace period for rcupreempt synchronize_rcu()
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index 5d59e850fb7..ce97a4df64d 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -147,7 +147,51 @@ struct rcu_ctrlblk {
wait_queue_head_t sched_wq; /* Place for rcu_sched to sleep. */
};
+struct rcu_dyntick_sched {
+ int dynticks;
+ int dynticks_snap;
+ int sched_qs;
+ int sched_qs_snap;
+ int sched_dynticks_snap;
+};
+
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_dyntick_sched, rcu_dyntick_sched) = {
+ .dynticks = 1,
+};
+
+void rcu_qsctr_inc(int cpu)
+{
+ struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
+
+ rdssp->sched_qs++;
+}
+
+#ifdef CONFIG_NO_HZ
+
+void rcu_enter_nohz(void)
+{
+ static DEFINE_RATELIMIT_STATE(rs, 10 * HZ, 1);
+
+ smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+ __get_cpu_var(rcu_dyntick_sched).dynticks++;
+ WARN_ON_RATELIMIT(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1, &rs);
+}
+
+void rcu_exit_nohz(void)
+{
+ static DEFINE_RATELIMIT_STATE(rs, 10 * HZ, 1);
+
+ __get_cpu_var(rcu_dyntick_sched).dynticks++;
+ smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+ WARN_ON_RATELIMIT(!(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1),
+ &rs);
+}
+
+#endif /* CONFIG_NO_HZ */
+
+
static DEFINE_PER_CPU(struct rcu_data, rcu_data);
+
static struct rcu_ctrlblk rcu_ctrlblk = {
.fliplock = __SPIN_LOCK_UNLOCKED(rcu_ctrlblk.fliplock),
.completed = 0,
@@ -427,10 +471,6 @@ static void __rcu_advance_callbacks(struct rcu_data *rdp)
}
}
-DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_dyntick_sched, rcu_dyntick_sched) = {
- .dynticks = 1,
-};
-
#ifdef CONFIG_NO_HZ
static DEFINE_PER_CPU(int, rcu_update_flag);