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rcutorture: Fix rcu_torture_one_read() pipe_count overflow comment

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BugLink: https://bugs.launchpad.net/bugs/2075154

[ Upstream commit 8b9b443fa860276822b25057cb3ff3b28734dec0 ]

The "pipe_count > RCU_TORTURE_PIPE_LEN" check has a comment saying "Should
not happen, but...".  This is only true when testing an RCU whose grace
periods are always long enough.  This commit therefore fixes this comment.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Closes: https://lore.kernel.org/lkml/CAHk-=wi7rJ-eGq+xaxVfzFEgbL9tdf6Kc8Z89rCpfcQOKm74Tw@mail.gmail.com/
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Paul E. McKenney
2024-03-06 19:21:47 -08:00
committed by Roxana Nicolescu
parent 248777ab2d
commit 4469080af8
1 changed files with 2 additions and 1 deletions
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kernel/rcu/rcutorture.c
+2 -1
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@@ -1993,7 +1993,8 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid)
preempt_disable();
pipe_count = READ_ONCE(p->rtort_pipe_count);
if (pipe_count > RCU_TORTURE_PIPE_LEN) {
/* Should not happen, but... */
// Should not happen in a correct RCU implementation,
// happens quite often for torture_type=busted.
pipe_count = RCU_TORTURE_PIPE_LEN;
}
completed = cur_ops->get_gp_seq();