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rcutorture: Fix rcu_torture_one_read() pipe_count overflow comment 

[ 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>
This commit is contained in:
Paul E. McKenney 2024-03-06 19:21:47 -08:00 committed by Greg Kroah-Hartman
parent 9e810bd995
commit 2e5ed1130e
1 changed files with 2 additions and 1 deletions
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kernel/rcu/rcutorture.c
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@ -1992,7 +1992,8 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid)
preempt_disable(); preempt_disable();
pipe_count = READ_ONCE(p->rtort_pipe_count); pipe_count = READ_ONCE(p->rtort_pipe_count);
if (pipe_count > RCU_TORTURE_PIPE_LEN) { 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; pipe_count = RCU_TORTURE_PIPE_LEN;
} }
completed = cur_ops->get_gp_seq(); completed = cur_ops->get_gp_seq();