Fu Wei wrote:

If pretimeout concept assumes that there are two timers, I
misunderstand the "pretimeout", then I will delete the pretimeout
immediately.

In my opinion, calling panic() on a pre-timeout is not useful, because 
that's really just a normal timeout.  If there were a way to "warn" user 
space that a timeout is about to occur, without a panic or reset, then 
that might be useful.  But as far as I can see, all you're doing is 
redefining the word "timeout".

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