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Subject[PATCH] rcu: Make struct rcu_head searchable
After wasting too much time trying to see where struct rcu_head was
declared, I finally found it in include/linux/types.h as a define for

To prevent other developers from wasting their precious time in
searching for this structure, add a comment to help them find it!

Cc: Al Viro <>
Cc: "Paul E. McKenney" <>
Signed-off-by: Steven "frustrated" Rostedt <>

diff --git a/include/linux/types.h b/include/linux/types.h
index 4d118ba..073e9a8 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -210,6 +210,9 @@ struct callback_head {
struct callback_head *next;
void (*func)(struct callback_head *head);
+ * Make "struct rcu_head {" seachable with this comment.
+ */
#define rcu_head callback_head

#endif /* __ASSEMBLY__ */

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