Commit-ID: ec3833ed02ae6ef2a933ece9de7cbab0c64c699e Gitweb: http://git.kernel.org/tip/ec3833ed02ae6ef2a933ece9de7cbab0c64c699e Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> AuthorDate: Mon, 11 Jan 2016 16:29:29 -0800 Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> CommitDate: Thu, 31 Mar 2016 13:34:07 -0700 rcu: Force boolean subscript for expedited stall warnings 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: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> --- kernel/rcu/tree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 62e73e0..64c2e32 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3808,7 +3808,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp) ndetected++; rdp = per_cpu_ptr(rsp->rda, cpu); pr_cont(" %d-%c%c%c", cpu, - "O."[cpu_online(cpu)], + "O."[!!cpu_online(cpu)], "o."[!!(rdp->grpmask & rnp->expmaskinit)], "N."[!!(rdp->grpmask & rnp->expmaskinitnext)]); } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html