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refscale: Fix misplaced data re-read 

This commit fixes a misplaced data re-read in the typesafe code.
The reason that this was not noticed is that this is a performance test
with no writers, so a mismatch could not occur.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Paul E. McKenney 2023-08-01 09:30:18 -07:00 committed by Frederic Weisbecker
parent 0bb80ecc33
commit 730c3ed4ba
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/refscale.c
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@ -655,12 +655,12 @@ retry:
goto retry;
}
un_delay(udl, ndl);
b = READ_ONCE(rtsp->a);
// Remember, seqlock read-side release can fail.
if (!rts_release(rtsp, start)) {
rcu_read_unlock();
goto retry;
}
b = READ_ONCE(rtsp->a);
WARN_ONCE(a != b, "Re-read of ->a changed from %u to %u.\n", a, b);
b = rtsp->b;
rcu_read_unlock();