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rcutorture: Fix rcu_torture_one_read() pipe_count overflow comment
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>
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1 changed files with 2 additions and 1 deletions
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@ -2000,7 +2000,8 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid)
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preempt_disable();
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preempt_disable();
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pipe_count = READ_ONCE(p->rtort_pipe_count);
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pipe_count = READ_ONCE(p->rtort_pipe_count);
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if (pipe_count > RCU_TORTURE_PIPE_LEN) {
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if (pipe_count > RCU_TORTURE_PIPE_LEN) {
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/* Should not happen, but... */
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// Should not happen in a correct RCU implementation,
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// happens quite often for torture_type=busted.
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pipe_count = RCU_TORTURE_PIPE_LEN;
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pipe_count = RCU_TORTURE_PIPE_LEN;
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}
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}
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completed = cur_ops->get_gp_seq();
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completed = cur_ops->get_gp_seq();
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