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Docs/RCU/rculist_nulls: Assign 'obj' before use from the examples

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Lookup example code snippets in rculist_nulls.rst are using 'obj'
without assignment.  Fix the code to assign it properly.

Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
SeongJae Park 2023-06-13 18:24:32 +00:00 committed by Paul E. McKenney
parent 3f831e38ce
commit 674dd36573
1 changed files with 2 additions and 2 deletions
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4
Documentation/RCU/rculist_nulls.rst
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@ -56,7 +56,7 @@ but a version with an additional memory barrier (smp_rmb())
struct hlist_node *node, *next;
for (pos = rcu_dereference((head)->first);
pos && ({ next = pos->next; smp_rmb(); prefetch(next); 1; }) &&
({ tpos = hlist_entry(pos, typeof(*tpos), member); 1; });
({ obj = hlist_entry(pos, typeof(*obj), member); 1; });
pos = rcu_dereference(next))
if (obj->key == key)
return obj;
@ -68,7 +68,7 @@ And note the traditional hlist_for_each_entry_rcu() misses this smp_rmb()::
struct hlist_node *node;
for (pos = rcu_dereference((head)->first);
pos && ({ prefetch(pos->next); 1; }) &&
({ tpos = hlist_entry(pos, typeof(*tpos), member); 1; });
({ obj = hlist_entry(pos, typeof(*obj), member); 1; });
pos = rcu_dereference(pos->next))
if (obj->key == key)
return obj;