linux-kernel - [PATCH] rcutorture: remove unneeded check

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Date:   Fri,  9 Oct 2020 12:47:36 -0700
From:   trix@...hat.com
To:     dave@...olabs.net, paulmck@...nel.org, josh@...htriplett.org,
        rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com, joel@...lfernandes.org,
        natechancellor@...il.com, ndesaulniers@...gle.com
Cc:     linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        clang-built-linux@...glegroups.com, Tom Rix <trix@...hat.com>
Subject: [PATCH] rcutorture: remove unneeded check

From: Tom Rix <trix@...hat.com>

clang static analysis reports this problem:

rcutorture.c:1999:2: warning: Called function pointer
  is null (null dereference)
        cur_ops->sync(); /* Later readers see above write. */
        ^~~~~~~~~~~~~~~

This is a false positive triggered by an earlier, later ignored
NULL check of sync() op.  By inspection of the rcu_torture_ops,
the sync() op is never uninitialized.  So this earlier check is
not needed.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 kernel/rcu/rcutorture.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index beba9e7963c8..6efc03a1d623 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1989,7 +1989,7 @@ static void rcu_torture_fwd_prog_nr(struct rcu_fwd *rfp,
 	unsigned long stopat;
 	static DEFINE_TORTURE_RANDOM(trs);
 
-	if  (cur_ops->call && cur_ops->sync && cur_ops->cb_barrier) {
+	if  (cur_ops->call && cur_ops->cb_barrier) {
 		init_rcu_head_on_stack(&fcs.rh);
 		selfpropcb = true;
 	}
-- 
2.18.1