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rcu: Clean up flavor-related definitions and comments in rcupdate.h 

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-07 18:12:26 -07:00
parent de3875d302
commit 2bd8b1a2af
1 changed files with 12 additions and 15 deletions
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27
include/linux/rcupdate.h
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@ -119,11 +119,10 @@ static inline void rcu_init_nohz(void) { }
* RCU_NONIDLE - Indicate idle-loop code that needs RCU readers
* @a: Code that RCU needs to pay attention to.
*
* RCU, RCU-bh, and RCU-sched read-side critical sections are forbidden
* in the inner idle loop, that is, between the rcu_idle_enter() and
* the rcu_idle_exit() -- RCU will happily ignore any such read-side
* critical sections. However, things like powertop need tracepoints
* in the inner idle loop.
* RCU read-side critical sections are forbidden in the inner idle loop,
* that is, between the rcu_idle_enter() and the rcu_idle_exit() -- RCU
* will happily ignore any such read-side critical sections. However,
* things like powertop need tracepoints in the inner idle loop.
*
* This macro provides the way out: RCU_NONIDLE(do_something_with_RCU())
* will tell RCU that it needs to pay attention, invoke its argument
@ -163,7 +162,7 @@ void exit_tasks_rcu_finish(void);
#else /* #ifdef CONFIG_TASKS_RCU */
#define rcu_tasks_qs(t) do { } while (0)
#define rcu_note_voluntary_context_switch(t) rcu_all_qs()
#define call_rcu_tasks call_rcu_sched
#define call_rcu_tasks call_rcu
#define synchronize_rcu_tasks synchronize_rcu
static inline void exit_tasks_rcu_start(void) { }
static inline void exit_tasks_rcu_finish(void) { }
@ -309,8 +308,8 @@ static inline void rcu_preempt_sleep_check(void) { }
* Helper functions for rcu_dereference_check(), rcu_dereference_protected()
* and rcu_assign_pointer(). Some of these could be folded into their
* callers, but they are left separate in order to ease introduction of
* multiple flavors of pointers to match the multiple flavors of RCU
* (e.g., __rcu_sched, and __srcu), should this make sense in the future.
* multiple pointers markings to match different RCU implementations
* (e.g., __srcu), should this make sense in the future.
*/
#ifdef __CHECKER__
@ -670,9 +669,8 @@ static inline void rcu_read_unlock(void)
* rcu_read_lock_bh() - mark the beginning of an RCU-bh critical section
*
* This is equivalent of rcu_read_lock(), but also disables softirqs.
* Note that synchronize_rcu() and friends may be used for the update
* side, although synchronize_rcu_bh() is available as a wrapper in the
* short term. Longer term, the _bh update-side API will be eliminated.
* Note that anything else that disables softirqs can also serve as
* an RCU read-side critical section.
*
* Note that rcu_read_lock_bh() and the matching rcu_read_unlock_bh()
* must occur in the same context, for example, it is illegal to invoke
@ -705,10 +703,9 @@ static inline void rcu_read_unlock_bh(void)
/**
* rcu_read_lock_sched() - mark the beginning of a RCU-sched critical section
*
* This is equivalent of rcu_read_lock(), but to be used when updates
* are being done using call_rcu_sched() or synchronize_rcu_sched().
* Read-side critical sections can also be introduced by anything that
* disables preemption, including local_irq_disable() and friends.
* This is equivalent of rcu_read_lock(), but disables preemption.
* Read-side critical sections can also be introduced by anything else
* that disables preemption, including local_irq_disable() and friends.
*
* Note that rcu_read_lock_sched() and the matching rcu_read_unlock_sched()
* must occur in the same context, for example, it is illegal to invoke