rcu: Create transitive rnp->lock acquisition functions

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Providing RCU's memory-ordering guarantees requires that the rcu_node
tree's locking provide transitive memory ordering, which the Linux kernel's
spinlocks currently do not provide unless smp_mb__after_unlock_lock()
is used.  Having a separate smp_mb__after_unlock_lock() after each and
every lock acquisition is error-prone, hard to read, and a bit annoying,
so this commit provides wrapper functions that pull in the
smp_mb__after_unlock_lock() invocations.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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Peter Zijlstra 2015-10-08 12:24:23 +02:00 • committed by Paul E. McKenney

parent 1ec218373b

commit 2a67e741bb

3 changed files with 71 additions and 64 deletions

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78

kernel/rcu/tree.c

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39

kernel/rcu/tree.h

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18

kernel/rcu/tree_plugin.h

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