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rcu: Update comments and help text for no more RCU-bh updaters

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This commit updates comments and help text to account for the fact that
RCU-bh update-side functions are now simple wrappers for their RCU or
RCU-sched counterparts.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-07-02 09:04:27 -07:00
parent 65cfe3583b
commit 82fcecfa81
6 changed files with 24 additions and 37 deletions
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12
include/linux/rcupdate.h
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@@ -688,14 +688,10 @@ 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 to be used when updates
* are being done using call_rcu_bh() or synchronize_rcu_bh(). Since
* both call_rcu_bh() and synchronize_rcu_bh() consider completion of a
* softirq handler to be a quiescent state, a process in RCU read-side
* critical section must be protected by disabling softirqs. Read-side
* critical sections in interrupt context can use just rcu_read_lock(),
* though this should at least be commented to avoid confusing people
* reading the code.
* 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 rcu_read_lock_bh() and the matching rcu_read_unlock_bh()
* must occur in the same context, for example, it is illegal to invoke