diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-01-11 16:29:29 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-08 11:25:33 +0100 |
| commit | 60c7f8fca1bbc6ac677a76f25843202b91f52abb (patch) | |
| tree | b909dbfd12e50333f674d09177798a49d4450ecf | |
| parent | 873beab3740a085ba284ed7daa4ab4068074db53 (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.c | 2 |
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)]); } |