rcu: add comment stating that list_empty() applies to RCU-protected lists
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Fri, 20 Aug 2010 04:43:09 +0000 (21:43 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Fri, 20 Aug 2010 16:00:18 +0000 (09:00 -0700)
commit65e6bf484c497f02d47a0faae69ee398cd59cfda
tree644a86b779a196da7c050cde9de593c413e0cc1e
parent80dcf60e6b97c7363971e7a0a788d8484d35f8a6
rcu: add comment stating that list_empty() applies to RCU-protected lists

Because list_empty() does not dereference any RCU-protected pointers, and
further does not pass such pointers to the caller (so that the caller
does not dereference them either), it is safe to use list_empty() on
RCU-protected lists.  There is no need for a list_empty_rcu().  This
commit adds a comment stating this explicitly.

Requested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
include/linux/rculist.h