Commit 60c7f8fc authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Greg Kroah-Hartman

rcu: Force boolean subscript for expedited stall warnings

commit ec3833ed upstream.

The cpu_online() function can return values other than 0 and 1, which
can result in subscript overflow when applied to a two-element array.
This commit allows for this behavior by using "!!" on the return value
from cpu_online() when used as a subscript.
Signed-off-by: default avatarPaul E. McKenney <>
Cc: "Rantala, Tommi" <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 873beab3
......@@ -3817,7 +3817,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
rdp = per_cpu_ptr(rsp->rda, cpu);
pr_cont(" %d-%c%c%c", cpu,
"o."[!!(rdp->grpmask & rnp->expmaskinit)],
"N."[!!(rdp->grpmask & rnp->expmaskinitnext)]);
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