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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-05-19 19:46:55 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-08-20 02:18:03 +0200 |
| commit | ded5e5ed2f3348ba2f9a319c6497e46c22850e97 (patch) | |
| tree | 8057debf79c6407544684928ca668b8954010791 /Documentation/DocBook/kernel-locking.tmpl | |
| parent | Update documentation to note the passage of INIT_RCU_HEAD() (diff) | |
| download | linux-ded5e5ed2f3348ba2f9a319c6497e46c22850e97.tar.xz linux-ded5e5ed2f3348ba2f9a319c6497e46c22850e97.zip | |
Update call_rcu() usage, add synchronize_rcu()
Reported-by: Kyle Hubert <khubert@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'Documentation/DocBook/kernel-locking.tmpl')
| -rw-r--r-- | Documentation/DocBook/kernel-locking.tmpl | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl index e6cc57460212..ed64d220baf2 100644 --- a/Documentation/DocBook/kernel-locking.tmpl +++ b/Documentation/DocBook/kernel-locking.tmpl @@ -1645,7 +1645,9 @@ the amount of locking which needs to be done. all the readers who were traversing the list when we deleted the element are finished. We use <function>call_rcu()</function> to register a callback which will actually destroy the object once - the readers are finished. + all pre-existing readers are finished. Alternatively, + <function>synchronize_rcu()</function> may be used to block until + all pre-existing are finished. </para> <para> But how does Read Copy Update know when the readers are @@ -1714,7 +1716,7 @@ the amount of locking which needs to be done. - object_put(obj); + list_del_rcu(&obj->list); cache_num--; -+ call_rcu(&obj->rcu, cache_delete_rcu, obj); ++ call_rcu(&obj->rcu, cache_delete_rcu); } /* Must be holding cache_lock */ |