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srcu: API for barrier after srcu read unlock 

srcu read lock/unlock include a full memory barrier
but that's an implementation detail.
Add an API for make memory fencing explicit for
users that need this barrier, to make sure we
can change it as needed without breaking all users.

Acked-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-11-04 22:36:17 +02:00 committed by Gleb Natapov
parent 80f5b5e700
commit ce332f662d
1 changed files with 14 additions and 0 deletions
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14
include/linux/srcu.h
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@ -237,4 +237,18 @@ static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
__srcu_read_unlock(sp, idx);
}
/**
* smp_mb__after_srcu_read_unlock - ensure full ordering after srcu_read_unlock
*
* Converts the preceding srcu_read_unlock into a two-way memory barrier.
*
* Call this after srcu_read_unlock, to guarantee that all memory operations
* that occur after smp_mb__after_srcu_read_unlock will appear to happen after
* the preceding srcu_read_unlock.
*/
static inline void smp_mb__after_srcu_read_unlock(void)
{
/* __srcu_read_unlock has smp_mb() internally so nothing to do here. */
}
#endif