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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2016-01-11 16:29:29 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-08 11:25:33 +0100
commit60c7f8fca1bbc6ac677a76f25843202b91f52abb (patch)
treeb909dbfd12e50333f674d09177798a49d4450ecf
parent873beab3740a085ba284ed7daa4ab4068074db53 (diff)
rcu: Force boolean subscript for expedited stall warnings
commit ec3833ed02ae6ef2a933ece9de7cbab0c64c699e 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: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: "Rantala, Tommi" <tommi.t.rantala@nokia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/rcu/tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 8a62cbfe1f2f..4e886ccd40db 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3817,7 +3817,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
continue;
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)]);
}