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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-01-12 03:29:29 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-31 23:34:07 +0300 |
| commit | ec3833ed02ae6ef2a933ece9de7cbab0c64c699e (patch) | |
| tree | f8fbd7a547108972415b53cab77755b599422275 /kernel/rcu | |
| parent | e2fd9d35847d1936398d44c4df68dceb3d7f64e7 (diff) | |
| download | linux-ec3833ed02ae6ef2a933ece9de7cbab0c64c699e.tar.xz | |
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@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 62e73e0a929f..64c2e3288551 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)]); } |