srcu: Shrink srcu.h by moving docbook and private function
The call_srcu() docbook entry is currently in include/linux/srcu.h, which causes needless processing for each include point. This commit therefore moves this entry to kernel/rcu/srcutree.c, which the compiler reads only once. In addition, the srcu_batches_completed() function is used only within RCU and its torture-test suites. This commit therefore also moves this function's declaration from include/linux/srcutiny.h, include/linux/srcutree.h, and include/linux/srcuclassic.h to kernel/rcu/rcu.h. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -65,32 +65,12 @@ int init_srcu_struct(struct srcu_struct *sp);
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#elif defined(CONFIG_SRCU)
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#error "Unknown SRCU implementation specified to kernel configuration"
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#else
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/* Dummy definition for things like notifiers. Actual use gets link error. */
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struct srcu_struct { };
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#endif
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/**
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* call_srcu() - Queue a callback for invocation after an SRCU grace period
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* @sp: srcu_struct in queue the callback
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* @head: structure to be used for queueing the SRCU callback.
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* @func: function to be invoked after the SRCU grace period
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*
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* The callback function will be invoked some time after a full SRCU
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* grace period elapses, in other words after all pre-existing SRCU
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* read-side critical sections have completed. However, the callback
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* function might well execute concurrently with other SRCU read-side
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* critical sections that started after call_srcu() was invoked. SRCU
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* read-side critical sections are delimited by srcu_read_lock() and
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* srcu_read_unlock(), and may be nested.
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*
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* The callback will be invoked from process context, but must nevertheless
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* be fast and must not block.
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*/
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void call_srcu(struct srcu_struct *sp, struct rcu_head *head,
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void (*func)(struct rcu_head *head));
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void cleanup_srcu_struct(struct srcu_struct *sp);
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int __srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
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void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
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@ -96,6 +96,5 @@ void process_srcu(struct work_struct *work);
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void synchronize_srcu_expedited(struct srcu_struct *sp);
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void srcu_barrier(struct srcu_struct *sp);
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unsigned long srcu_batches_completed(struct srcu_struct *sp);
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#endif
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@ -88,9 +88,4 @@ static inline void srcu_barrier(struct srcu_struct *sp)
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synchronize_srcu(sp);
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}
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static inline unsigned long srcu_batches_completed(struct srcu_struct *sp)
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{
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return 0;
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}
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#endif
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@ -141,6 +141,5 @@ void process_srcu(struct work_struct *work);
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void synchronize_srcu_expedited(struct srcu_struct *sp);
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void srcu_barrier(struct srcu_struct *sp);
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unsigned long srcu_batches_completed(struct srcu_struct *sp);
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#endif
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@ -492,6 +492,11 @@ static inline unsigned long rcu_exp_batches_completed_sched(void)
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return 0;
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}
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static inline unsigned long srcu_batches_completed(struct srcu_struct *sp)
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{
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return 0;
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}
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static inline void rcu_force_quiescent_state(void)
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{
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}
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@ -519,6 +524,7 @@ unsigned long rcu_batches_completed_bh(void);
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unsigned long rcu_batches_completed_sched(void);
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unsigned long rcu_exp_batches_completed(void);
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unsigned long rcu_exp_batches_completed_sched(void);
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unsigned long srcu_batches_completed(struct srcu_struct *sp);
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void show_rcu_gp_kthreads(void);
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void rcu_force_quiescent_state(void);
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void rcu_bh_force_quiescent_state(void);
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@ -854,6 +854,23 @@ void __call_srcu(struct srcu_struct *sp, struct rcu_head *rhp,
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srcu_funnel_exp_start(sp, sdp->mynode, s);
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}
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/**
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* call_srcu() - Queue a callback for invocation after an SRCU grace period
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* @sp: srcu_struct in queue the callback
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* @head: structure to be used for queueing the SRCU callback.
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* @func: function to be invoked after the SRCU grace period
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*
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* The callback function will be invoked some time after a full SRCU
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* grace period elapses, in other words after all pre-existing SRCU
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* read-side critical sections have completed. However, the callback
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* function might well execute concurrently with other SRCU read-side
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* critical sections that started after call_srcu() was invoked. SRCU
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* read-side critical sections are delimited by srcu_read_lock() and
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* srcu_read_unlock(), and may be nested.
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*
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* The callback will be invoked from process context, but must nevertheless
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* be fast and must not block.
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*/
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void call_srcu(struct srcu_struct *sp, struct rcu_head *rhp,
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rcu_callback_t func)
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{
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