diff options
Diffstat (limited to 'include/linux/rcutiny.h')
| -rw-r--r-- | include/linux/rcutiny.h | 103 |
1 files changed, 63 insertions, 40 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index 7c1ecdb356d8..f519cd680228 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -14,12 +14,43 @@ #include <asm/param.h> /* for HZ */ -/* Never flag non-existent other CPUs! */ -static inline bool rcu_eqs_special_set(int cpu) { return false; } +struct rcu_gp_oldstate { + unsigned long rgos_norm; +}; -static inline unsigned long get_state_synchronize_rcu(void) +// Maximum number of rcu_gp_oldstate values corresponding to +// not-yet-completed RCU grace periods. +#define NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE 2 + +/* + * Are the two oldstate values the same? See the Tree RCU version for + * docbook header. + */ +static inline bool same_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp1, + struct rcu_gp_oldstate *rgosp2) { - return 0; + return rgosp1->rgos_norm == rgosp2->rgos_norm; +} + +unsigned long get_state_synchronize_rcu(void); + +static inline void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) +{ + rgosp->rgos_norm = get_state_synchronize_rcu(); +} + +unsigned long start_poll_synchronize_rcu(void); + +static inline void start_poll_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) +{ + rgosp->rgos_norm = start_poll_synchronize_rcu(); +} + +bool poll_state_synchronize_rcu(unsigned long oldstate); + +static inline bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) +{ + return poll_state_synchronize_rcu(rgosp->rgos_norm); } static inline void cond_synchronize_rcu(unsigned long oldstate) @@ -27,32 +58,36 @@ static inline void cond_synchronize_rcu(unsigned long oldstate) might_sleep(); } -extern void rcu_barrier(void); +static inline void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) +{ + cond_synchronize_rcu(rgosp->rgos_norm); +} -static inline void synchronize_rcu_expedited(void) +static inline unsigned long start_poll_synchronize_rcu_expedited(void) { - synchronize_rcu(); + return start_poll_synchronize_rcu(); } -/* - * Add one more declaration of kvfree() here. It is - * not so straight forward to just include <linux/mm.h> - * where it is defined due to getting many compile - * errors caused by that include. - */ -extern void kvfree(const void *addr); +static inline void start_poll_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp) +{ + rgosp->rgos_norm = start_poll_synchronize_rcu_expedited(); +} -static inline void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func) +static inline void cond_synchronize_rcu_expedited(unsigned long oldstate) { - if (head) { - call_rcu(head, func); - return; - } + cond_synchronize_rcu(oldstate); +} - // kvfree_rcu(one_arg) call. - might_sleep(); +static inline void cond_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp) +{ + cond_synchronize_rcu_expedited(rgosp->rgos_norm); +} + +extern void rcu_barrier(void); + +static inline void synchronize_rcu_expedited(void) +{ synchronize_rcu(); - kvfree((void *) func); } void rcu_qs(void); @@ -68,26 +103,20 @@ static inline void rcu_softirq_qs(void) rcu_tasks_qs(current, (preempt)); \ } while (0) -static inline int rcu_needs_cpu(u64 basemono, u64 *nextevt) +static inline int rcu_needs_cpu(void) { - *nextevt = KTIME_MAX; return 0; } +static inline void rcu_request_urgent_qs_task(struct task_struct *t) { } + /* * Take advantage of the fact that there is only one CPU, which * allows us to ignore virtualization-based context switches. */ -static inline void rcu_virt_note_context_switch(int cpu) { } +static inline void rcu_virt_note_context_switch(void) { } static inline void rcu_cpu_stall_reset(void) { } static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; } -static inline void rcu_idle_enter(void) { } -static inline void rcu_idle_exit(void) { } -static inline void rcu_irq_enter(void) { } -static inline void rcu_irq_exit_irqson(void) { } -static inline void rcu_irq_enter_irqson(void) { } -static inline void rcu_irq_exit(void) { } -static inline void rcu_irq_exit_preempt(void) { } static inline void rcu_irq_exit_check_preempt(void) { } static inline void exit_rcu(void) { } static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t) @@ -95,17 +124,11 @@ static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t) return false; } static inline void rcu_preempt_deferred_qs(struct task_struct *t) { } -#ifdef CONFIG_SRCU void rcu_scheduler_starting(void); -#else /* #ifndef CONFIG_SRCU */ -static inline void rcu_scheduler_starting(void) { } -#endif /* #else #ifndef CONFIG_SRCU */ static inline void rcu_end_inkernel_boot(void) { } static inline bool rcu_inkernel_boot_has_ended(void) { return true; } static inline bool rcu_is_watching(void) { return true; } -static inline void rcu_momentary_dyntick_idle(void) { } -static inline void kfree_rcu_scheduler_running(void) { } -static inline bool rcu_gp_might_be_stalled(void) { return false; } +static inline void rcu_momentary_eqs(void) { } /* Avoid RCU read-side critical sections leaking across. */ static inline void rcu_all_qs(void) { barrier(); } @@ -116,6 +139,6 @@ static inline void rcu_all_qs(void) { barrier(); } #define rcutree_offline_cpu NULL #define rcutree_dead_cpu NULL #define rcutree_dying_cpu NULL -static inline void rcu_cpu_starting(unsigned int cpu) { } +static inline void rcutree_report_cpu_starting(unsigned int cpu) { } #endif /* __LINUX_RCUTINY_H */ |