Currently, rcu_torture_stall() does a one-jiffy timed wait when
stall_cpu_block is set. This works, but emits a pointless splat in
CONFIG_PREEMPT=y kernels. This commit avoids this splat by instead
invoking preempt_schedule() in CONFIG_PREEMPT=y kernels.
This uses an admittedly ugly #ifdef, but abstracted approaches just
looked worse. A prettier approach would provide a preempt_schedule()
definition with a WARN_ON() for CONFIG_PREEMPT=n kernels, but this seems
quite silly.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
__func__, raw_smp_processor_id());
while (ULONG_CMP_LT((unsigned long)ktime_get_seconds(),
stop_at))
- if (stall_cpu_block)
+ if (stall_cpu_block) {
+#ifdef CONFIG_PREEMPTION
+ preempt_schedule();
+#else
schedule_timeout_uninterruptible(HZ);
+#endif
+ }
if (stall_cpu_irqsoff)
local_irq_enable();
else if (!stall_cpu_block)