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srcu: Add cleanup_srcu_struct_quiesced()

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The current cleanup_srcu_struct() flushes work, which prevents it
from being invoked from some workqueue contexts, as well as from
atomic (non-blocking) contexts.  This patch therefore introduced a
cleanup_srcu_struct_quiesced(), which can be invoked only after all
activity on the specified srcu_struct has completed.  This restriction
allows cleanup_srcu_struct_quiesced() to be invoked from workqueue
contexts as well as from atomic contexts.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Nitzan Carmi <nitzanc@mellanox.com>
Tested-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Paul E. McKenney 2018-04-05 17:19:17 -07:00
parent 17672480fb
commit f7194ac32c
4 changed files with 64 additions and 18 deletions
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36
include/linux/srcu.h
View file

@ -69,11 +69,45 @@ struct srcu_struct { };
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);
void _cleanup_srcu_struct(struct srcu_struct *sp, bool quiesced);
int __srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
void synchronize_srcu(struct srcu_struct *sp);
/**
* cleanup_srcu_struct - deconstruct a sleep-RCU structure
* @sp: structure to clean up.
*
* Must invoke this after you are finished using a given srcu_struct that
* was initialized via init_srcu_struct(), else you leak memory.
*/
static inline void cleanup_srcu_struct(struct srcu_struct *sp)
{
_cleanup_srcu_struct(sp, false);
}
/**
* cleanup_srcu_struct_quiesced - deconstruct a quiesced sleep-RCU structure
* @sp: structure to clean up.
*
* Must invoke this after you are finished using a given srcu_struct that
* was initialized via init_srcu_struct(), else you leak memory. Also,
* all grace-period processing must have completed.
*
* "Completed" means that the last synchronize_srcu() and
* synchronize_srcu_expedited() calls must have returned before the call
* to cleanup_srcu_struct_quiesced(). It also means that the callback
* from the last call_srcu() must have been invoked before the call to
* cleanup_srcu_struct_quiesced(), but you can use srcu_barrier() to help
* with this last. Violating these rules will get you a WARN_ON() splat
* (with high probability, anyway), and will also cause the srcu_struct
* to be leaked.
*/
static inline void cleanup_srcu_struct_quiesced(struct srcu_struct *sp)
{
_cleanup_srcu_struct(sp, true);
}
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/**