Re: [PATCH] move die notifier handling to common code

[Christoph Hellwig <hch@lst.de>]

On Mon, Mar 26, 2007 at 11:32:09AM +1000, Paul Mackerras wrote:
> Seems OK, although I think kprobes should not be using notify_die.
> The set of events that kprobes is interested in has no intersection at
> all with the set that any other consumer of the notify_die events is
> interested in, on any architecture.
> 
> Furthermore, the multiplexing of the kprobes events through notify_die
> really serves no useful purpose.  It just means that
> kprobe_exceptions_notify has to demultiplex the events with a switch
> statement.  There is no significant common code for all events in
> kprobe_exceptions_notify, just a simple check whether the event
> happened in user mode.
> 
> However, all that is in arch code so can be changed per-arch if
> desired.

I tend to agree.  Unfortunately powers higher than me like these
horrible notifier schemes.  Then again at least the die path is not
performance critical unlike the page faul path where I still need a
comment for you on getting rid of the notifier.