Hello Steven,
I just tried the new kernel version 3.2.60-rt87 on our ARM-Cortex-A8
board and while it works fine with the standard configuration, it won't
boot if the option CONFIG_MISSED_TIMER_OFFSETS_HIST is set.
The kernel error message reports a NULL pointer dereference at
__hrtimer_start_range_ns+0xf4, which probably is line 1038 in file
kernel/hrtimer.c, where new_base->get_time() is called before new_base
is set.
(actually there was a compiler warning too, but I didn't pay enough
attention to the compiler output...)
#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
{
ktime_t now = new_base->get_time();
if (ktime_to_ns(tim) < ktime_to_ns(now))
timer->praecox = now;
else
timer->praecox = ktime_set(0, 0);
}
#endif
hrtimer_set_expires_range_ns(timer, tim, delta_ns);
/* Switch the timer base, if necessary: */
new_base = switch_hrtimer_base(timer, base, mode &
HRTIMER_MODE_PINNED);
Since I moved the #ifdef...#endif block down below the
new_base=switch_hrtimer... statement, the kernel boots and works so far,
but I'm not sure if this is what was originally intended here.
Best regards
Rolf
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