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(cherry-picked from54acd4397d) This commit consolidates the debug checking for list_add_rcu() into the new single __list_add_valid() debug function. Notably, this commit fixes the sanity check that was added in commit17a801f4bf("list_debug: WARN for adding something already in the list"), which wasn't checking RCU-protected lists. Change-Id: I1f7e169d4dc45bbc9938087a171c5df747344414 Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Satya Tangirala <satyat@google.com> Signed-off-by: Amit Pundir <amit.pundir@linaro.org>