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rcu: get rid of signed overflow in check_cpu_stall()

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Signed integer overflow is undefined by the C standard, so move
calculations to unsigned.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2011-05-02 23:40:04 -07:00
parent b554d7de8d
commit bad6e1393c
1 changed files with 8 additions and 5 deletions
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13
kernel/rcutree.c
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@ -581,21 +581,24 @@ static void print_cpu_stall(struct rcu_state *rsp)
static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
{
long delta;
unsigned long j;
unsigned long js;
struct rcu_node *rnp;
if (rcu_cpu_stall_suppress)
return;
delta = jiffies - ACCESS_ONCE(rsp->jiffies_stall);
j = ACCESS_ONCE(jiffies);
js = ACCESS_ONCE(rsp->jiffies_stall);
rnp = rdp->mynode;
if ((ACCESS_ONCE(rnp->qsmask) & rdp->grpmask) && delta >= 0) {
if ((ACCESS_ONCE(rnp->qsmask) & rdp->grpmask) && ULONG_CMP_GE(j, js)) {
/* We haven't checked in, so go dump stack. */
print_cpu_stall(rsp);
} else if (rcu_gp_in_progress(rsp) && delta >= RCU_STALL_RAT_DELAY) {
} else if (rcu_gp_in_progress(rsp) &&
ULONG_CMP_GE(j, js + RCU_STALL_RAT_DELAY)) {
/* They had two time units to dump stack, so complain. */
/* They had a few time units to dump stack, so complain. */
print_other_cpu_stall(rsp);
}
}