[Bug testsuite/20600] parallel testsuite hang in [nd_]syscall.exp

["dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20600

--- Comment #5 from David Smith <dsmith at redhat dot com> ---
(In reply to David Smith from comment #4)
> Here's an update.

... stuff deleted ...

> On RHEL7, on_each_cpu() looks like the following:

Nope, that was on_each_cpu() for a single-processor kernel. Here's
on_each_cpu() for a SMP kernel:

====
/*
 * Call a function on all processors.  May be used during early boot while
 * early_boot_irqs_disabled is set.  Use local_irq_save/restore() instead
 * of local_irq_disable/enable().
 */
int on_each_cpu(void (*func) (void *info), void *info, int wait)
{
        unsigned long flags;
        int ret = 0;

        preempt_disable();
        ret = smp_call_function(func, info, wait);
        local_irq_save(flags);
        func(info);
        local_irq_restore(flags);
        preempt_enable();
        return ret;
}
====

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