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Commit 5a0465e1 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent c350c008

include/linux/srcu.h

+0 −20
Original line number Diff line number Diff line
@@ -65,32 +65,12 @@ int init_srcu_struct(struct srcu_struct *sp); 
#elif defined(CONFIG_SRCU)

#error "Unknown SRCU implementation specified to kernel configuration"

#else



/* Dummy definition for things like notifiers.  Actual use gets link error. */

struct srcu_struct { };



#endif



/**

 * call_srcu() - Queue a callback for invocation after an SRCU grace period

 * @sp: srcu_struct in queue the callback

 * @head: structure to be used for queueing the SRCU callback.

 * @func: function to be invoked after the SRCU grace period

 *

 * The callback function will be invoked some time after a full SRCU

 * grace period elapses, in other words after all pre-existing SRCU

 * read-side critical sections have completed.  However, the callback

 * function might well execute concurrently with other SRCU read-side

 * critical sections that started after call_srcu() was invoked.  SRCU

 * read-side critical sections are delimited by srcu_read_lock() and

 * srcu_read_unlock(), and may be nested.

 *

 * The callback will be invoked from process context, but must nevertheless

 * be fast and must not block.

 */

void call_srcu(struct srcu_struct *sp, struct rcu_head *head,

		void (*func)(struct rcu_head *head));



void cleanup_srcu_struct(struct srcu_struct *sp);

int __srcu_read_lock(struct srcu_struct *sp) __acquires(sp);

void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);

include/linux/srcuclassic.h

+0 −1
Original line number Diff line number Diff line
@@ -96,6 +96,5 @@ void process_srcu(struct work_struct *work); 


void synchronize_srcu_expedited(struct srcu_struct *sp);

void srcu_barrier(struct srcu_struct *sp);

unsigned long srcu_batches_completed(struct srcu_struct *sp);



#endif

include/linux/srcutiny.h

+0 −5
Original line number Diff line number Diff line
@@ -88,9 +88,4 @@ static inline void srcu_barrier(struct srcu_struct *sp) 
	synchronize_srcu(sp);

}



static inline unsigned long srcu_batches_completed(struct srcu_struct *sp)

{

	return 0;

}



#endif

include/linux/srcutree.h

+0 −1
Original line number Diff line number Diff line
@@ -141,6 +141,5 @@ void process_srcu(struct work_struct *work); 


void synchronize_srcu_expedited(struct srcu_struct *sp);

void srcu_barrier(struct srcu_struct *sp);

unsigned long srcu_batches_completed(struct srcu_struct *sp);



#endif

kernel/rcu/rcu.h

+6 −0
Original line number Diff line number Diff line
@@ -492,6 +492,11 @@ static inline unsigned long rcu_exp_batches_completed_sched(void) 
	return 0;

}



static inline unsigned long srcu_batches_completed(struct srcu_struct *sp)

{

	return 0;

}



static inline void rcu_force_quiescent_state(void)

{

}
@@ -519,6 +524,7 @@ unsigned long rcu_batches_completed_bh(void); 
unsigned long rcu_batches_completed_sched(void);

unsigned long rcu_exp_batches_completed(void);

unsigned long rcu_exp_batches_completed_sched(void);

unsigned long srcu_batches_completed(struct srcu_struct *sp);

void show_rcu_gp_kthreads(void);

void rcu_force_quiescent_state(void);

void rcu_bh_force_quiescent_state(void);