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rcutorture: Re-use value stored to ->rtort_pipe_count instead of re-reading

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Currently, the rcu_torture_pipe_update_one() writes the value (i + 1)
to rp->rtort_pipe_count, then immediately re-reads it in order to compare
it to RCU_TORTURE_PIPE_LEN.  This re-read is pointless because no other
update to rp->rtort_pipe_count can occur at this point.  This commit
therefore instead re-uses the (i + 1) value stored in the comparison
instead of re-reading rp->rtort_pipe_count.

Signed-off-by: linke li <lilinke99@qq.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
linke li 2024-03-06 19:51:10 -08:00 committed by Uladzislau Rezki (Sony)
parent 8b9b443fa8
commit a10e3cbf32
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/rcutorture.c
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@ -467,7 +467,7 @@ rcu_torture_pipe_update_one(struct rcu_torture *rp)
atomic_inc(&rcu_torture_wcount[i]);
WRITE_ONCE(rp->rtort_pipe_count, i + 1);
ASSERT_EXCLUSIVE_WRITER(rp->rtort_pipe_count);
if (rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) {
if (i + 1 >= RCU_TORTURE_PIPE_LEN) {
rp->rtort_mbtest = 0;
return true;
}