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authorIngo Molnar <mingo@elte.hu>2010-08-23 11:32:34 +0200
committerIngo Molnar <mingo@elte.hu>2010-08-23 11:32:34 +0200
commita6b9b4d50f492630443b38404d1f436b3b748c14 (patch)
treef3512389c42cecfae50b6a315ec6ab1fa470e30d /Documentation/DocBook/kernel-locking.tmpl
parente36c886a0f9d624377977fa6cae309cfd7f362fa (diff)
parent28457ee69c473a903e51e26c7bcd6f1e9eceb93e (diff)
downloadkernel-a6b9b4d50f492630443b38404d1f436b3b748c14.tar.gz
Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu into core/rcu
Diffstat (limited to 'Documentation/DocBook/kernel-locking.tmpl')
-rw-r--r--Documentation/DocBook/kernel-locking.tmpl14
1 files changed, 4 insertions, 10 deletions
diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl
index 0b1a3f97f285..d7884b13fb11 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(&amp;obj-&gt;list);
cache_num--;
-+ call_rcu(&amp;obj-&gt;rcu, cache_delete_rcu, obj);
++ call_rcu(&amp;obj-&gt;rcu, cache_delete_rcu);
}
/* Must be holding cache_lock */
@@ -1725,14 +1727,6 @@ the amount of locking which needs to be done.
if (++cache_num > MAX_CACHE_SIZE) {
struct object *i, *outcast = NULL;
list_for_each_entry(i, &amp;cache, list) {
-@@ -85,6 +94,7 @@
- obj-&gt;popularity = 0;
- atomic_set(&amp;obj-&gt;refcnt, 1); /* The cache holds a reference */
- spin_lock_init(&amp;obj-&gt;lock);
-+ INIT_RCU_HEAD(&amp;obj-&gt;rcu);
-
- spin_lock_irqsave(&amp;cache_lock, flags);
- __cache_add(obj);
@@ -104,12 +114,11 @@
struct object *cache_find(int id)
{