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srcu: Update synchronize_srcu_expedited()'s comments

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Because synchronize_srcu_expedited() no longer uses
synchronize_rcu_sched_expedited(), synchronize_srcu_expedited() no longer
indirectly acquires any CPU-hotplug-related locks.  This commit therefore
updates the comments accordingly.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Lai Jiangshan 2012-11-29 16:46:08 +08:00 committed by Paul E. McKenney
parent 34a64b6bb6
commit 49271ca606
1 changed files with 5 additions and 6 deletions
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11
kernel/srcu.c
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@ -477,12 +477,11 @@ EXPORT_SYMBOL_GPL(synchronize_srcu);
* Wait for an SRCU grace period to elapse, but be more aggressive about
* spinning rather than blocking when waiting.
*
* Note that it is illegal to call this function while holding any lock
* that is acquired by a CPU-hotplug notifier. It is also illegal to call
* synchronize_srcu_expedited() from the corresponding SRCU read-side
* critical section; doing so will result in deadlock. However, it is
* perfectly legal to call synchronize_srcu_expedited() on one srcu_struct
* from some other srcu_struct's read-side critical section, as long as
* Note that it is also illegal to call synchronize_srcu_expedited()
* from the corresponding SRCU read-side critical section;
* doing so will result in deadlock. However, it is perfectly legal
* to call synchronize_srcu_expedited() on one srcu_struct from some
* other srcu_struct's read-side critical section, as long as
* the resulting graph of srcu_structs is acyclic.
*/
void synchronize_srcu_expedited(struct srcu_struct *sp)