[Bug runtime/6504] change _stp_print_flush to avoid calling into kernel/relay.c

[mhiramat at redhat dot com]

------- Additional Comments From mhiramat at redhat dot com  2008-05-19 20:28 -------
(In reply to comment #2)
> This patch adds utt_switch_subbuf() (almost same as relay_switch_subbuf()) and
> an interval timer to avoid calling __mod_timer from probe handler.

Actually, I tried to fix this bug by just replacing timer with workqueue. However,
it was not safe because queue_delayed_work() used add_timer(), and queue_work()
used wake_up(). So it will cause another deadlock. That is why I decided to use 
an interval timer.


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http://sourceware.org/bugzilla/show_bug.cgi?id=6504

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