diff options
Diffstat (limited to 'include/linux/rcupreempt.h')
| -rw-r--r-- | include/linux/rcupreempt.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/rcupreempt.h b/include/linux/rcupreempt.h index 60c2a033b19..01152ed532c 100644 --- a/include/linux/rcupreempt.h +++ b/include/linux/rcupreempt.h @@ -82,5 +82,27 @@ extern struct rcupreempt_trace *rcupreempt_trace_cpu(int cpu); struct softirq_action; +#ifdef CONFIG_NO_HZ +DECLARE_PER_CPU(long, dynticks_progress_counter); + +static inline void rcu_enter_nohz(void) +{ + __get_cpu_var(dynticks_progress_counter)++; + WARN_ON(__get_cpu_var(dynticks_progress_counter) & 0x1); + mb(); +} + +static inline void rcu_exit_nohz(void) +{ + mb(); + __get_cpu_var(dynticks_progress_counter)++; + WARN_ON(!(__get_cpu_var(dynticks_progress_counter) & 0x1)); +} + +#else /* CONFIG_NO_HZ */ +#define rcu_enter_nohz() do { } while (0) +#define rcu_exit_nohz() do { } while (0) +#endif /* CONFIG_NO_HZ */ + #endif /* __KERNEL__ */ #endif /* __LINUX_RCUPREEMPT_H */ |